Chris Perry, Author

Tag: Toyotomi Hideyoshi

The Honnoji Incident – Oda Nobunaga. Part Four.

“The enemy is at Honnoji” – Akechi Mitsuhide

By 1582, Oda Nobunaga was the most powerful man in the realm; in fact, it could be argued that he was the most powerful man Japan had seen in centuries. A combination of ruthless political manoeuvring and brutal military campaigns had left him on the verge of finally reuniting the nation and ending the Sengoku Jidai.

Only the Mori Clan still had the strength to stifle Nobunaga’s ambitions, and in May 1582, he announced his intention to march against them with all his might. The catalyst for this next campaign was a message from Hashiba Hideyoshi, who was besieging Takamatsu Castle (in modern-day Okayama). The message read that Mori Terumoto was marching to relieve the siege, presenting Nobunaga with an opportunity to meet the Mori in open battle and crush them.

A scene from the Battle of Takamatsu Castle. Hideyoshi attempted to end the siege by flooding the castle, a tactic that was ultimately unsuccessful.

It is generally accepted by historians that Nobunaga intended not only to defeat the Mori but also subjugate Shikoku and, eventually, Kyushu as well, viewing the campaign against the Mori as part of a wider strategy to bring the entire nation under his command. In preparation for this, he dispatched several generals to support Hideyoshi, most notably Akechi Mitsuhide.

In the days that followed, Nobunaga was seen to be in good spirits and laid on lavish entertainment for those who came to visit him, including Tokugawa Ieyasu, who departed Azuchi on June 21st, embarking on a tour of Kyoto, Osaka, and the surrounding region. On the same day, Nobunaga’s son and heir, Nobutada, arrived in Kyoto for reasons that aren’t entirely clear (some speculate he meant to accompany Ieyasu). Whatever his purpose, his arrival in the capital meant that when Nobunaga himself departed Azuchi for Kyoto on June 29th, father and son would be in the same place, at the same time.

Azuchi Castle, Nobunaga’s base, as it appeared around 1582.

Exactly why Nobunaga went to Kyoto first is debated, with some suggesting he planned to attack Shikoku first, going via Kyoto and the port at Sakai (modern Osaka). Other sources say he went to deal with negotiations at the Imperial Court, and others still suggest he wanted to show off a new tea set he had recently acquired. (This may sound a touch comical to a modern audience, but the tea ceremony was a serious matter in Japan at the time.)

On June 30th, Nobunaga held said tea ceremony, which was followed by a drinking party, during which Nobunaga’s son, Nobutada, arrived, and father and son drank and talked together, little knowing that it would be their last meeting. Sources tell us that the party ended late, and Nobutada returned to his accommodation at nearby Myokakuji Temple, and Nobunaga retired for the night shortly afterwards.

Oda Nobutada, Nobunaga’s son and heir.

Though Honnoji was a temple, as the primary residence of Nobunaga in Kyoto, it wasn’t undefended. Excavations in 2007 found evidence of a moat and some earthworks, suggesting that the site had been partially fortified, though it was far from a fortress, and Nobunaga was protected by only a few dozen servants and his personal entourage.

Nobunaga clearly didn’t expect to be attacked, and why should he have? He was the most powerful man in the realm, in the heart of the capital city, with hundreds of thousands of warriors at his command. His enemies were far away, and even in the unlikely event that the army under Hideyoshi was defeated, he could call on other, just as formidable forces.

Honnoji as it appears today. The current temple is located at a different site from that in 1582; after being rebuilt by Hideyoshi in 1592, it was destroyed by fire in 1788 and 1864, and then underwent further renovation in 1928.
_{^{＋－ – 投稿者自身による著作物, CC 表示-継承 3.0, https://commons.wikimedia.org/w/index.php?curid=107655314による}}

One of these was a force of around 13,000 men under Akechi Mitsuhide. In the afternoon of June 30th, Mitsuhide claimed to have received a message from Nobunaga, instructing him to bring his force to Kyoto for review. The letter, if it existed at all, was certainly a forgery, but by that evening, Mitsuhide had arrived at Kameyama (modern Kameoka), north of Kyoto. By the next morning, they had reached the Katsura River, and at this point, it is unclear if Mitsuhide’s army understood their objective.

Sources from men serving in this force suggest they believed that they were going to attack Tokugawa Ieyasu, nominally on the orders of Nobunaga himself. This is supported by the semi-contemporary “History of Japan”, written by the Jesuit, Luis Frois, which suggests that Mitsuhide’s army believed they were acting under Nobunaga’s secret order, at least initially.

Akechi Mitsuhide, the man behind the Honnoji Incident.

At this point, Mitsuhide is supposed to have uttered the famous phrase “The Enemy is a Honnoji” announcing his rebellious intention (as everyone knew that was Nobunaga’s base.) Unfortunately, as dramatic as that scene might have been, the first source for it doesn’t appear until 1641, nearly 60 years after the event, and there are no contemporary sources that tell us what Mitsuhide might or might not have said.

What we know is that by dawn, Mitsuhides forces had surrounded Honnoji. What followed was a bloody, but ultimately one-sided fight. All sides agree that Nobunaga and his pages fought bravely, but they were hopelessly outnumbered, and the fighting was over by around 8am. We don’t know exactly how Nobunaga died, but the sources agree that he fought with a bow, and then a spear, before suffering some kind of injury (the sources differ) and retreating into the already burning Honnoji, where he presumably committed seppuku.

A 19th-century depiction of Nobunaga’s last stand. Though we don’t know exactly how he died, sources agree he fought bravely until an injury forced him to retreat.

Nobunaga’s son, Nobutada, had, upon hearing that Honnoji was under attack, rushed to help, only to be overwhelmed and forced back to his own accommodations at Myokakuji Temple, where he too was forced to commit seppuku as the temple burned around him, his body consumed by the flames.

Rumours of their survival sprang up almost immediately. Since neither body was ever identified (this being before DNA or dental records), Mitsuhide could not prove the deed was done, and any hope he had of securing support went up in the same smoke that Nobunaga and his son had.

Another 19th-century depiction of Nobunaga’s end. Though heavily stylised, it displays the flames that would ultimately consume Nobunaga’s body.

Whatever his actual motivation (which we’ll look at in a moment), Mitsuhide’s triumph would be short-lived. Though his forces had successfully killed Nobunaga, his son, Nobutada, and most of his inner circle, and secured Kyoto, the same forces that Nobunaga might have called on to defend him were now focused on avenging him.

Mitsuhide swiftly withdrew to Azuchi Castle, from where he tried to rally support, and wrote to the Imperial Court, seeking to legitimise his position. There are no records of any response, and he soon ran out of time. Hashiba Hideyoshi had made peace with the Mori (who were apparently initially unaware of Nobunaga’s death) and was now marching against him.

The site of the Battle of Yamazaki as it appears today, seen from Mt Tenno, from which the battle is sometimes called The Battle of Tennozan.

Mitsuhide was outnumbered two or three to one, and at the Battle of Yamazaki on July 12th, he was decisively defeated. Although losses were similar on both sides (about 3000), Mitsuhide’s army suffered from serious morale problems and disintegrated as the battle went against them, leaving Mitsuhide with just 700 warriors at day’s end.

Mitsuhide himself survived the battle, but he was either killed in the aftermath (possibly by bandits or opportunistic peasants) or else committed suicide due to injuries sustained on the battlefield. Whatever his end, he was definitely dead by the time his head was displayed outside the burned remains of Honnoji Temple, on or around July 17th.

Akechi Mitsuhide’s grave at Saikyoji Temple in Kyoto.

No sooner was Mitsuhide dead than questions were raised about why he had betrayed his lord. Though Samurai overthrowing their overlords was nothing new, Nobunaga was uncommonly powerful, and his death threatened to unravel the fragile peace he had secured, especially in light of Mitushide’s failure to secure support or legitimacy in its aftermath.

Contemporary scholars and modern historians continue to debate exactly why Mitsuhide betrayed Nobunaga. He was certainly mistreated and often humiliated, sometimes even being publicly beaten by Nobunaga himself, so simple revenge is a possible motive. Other sources suggest it was to avenge his mother, who had served as a hostage to secure a truce years earlier, only for Nobunaga to break it, resulting in the poor woman being executed.

Mitsuhide’s mother hangs from a tree in consequence of Nobunaga breaking the truce that her life was the guarantee of.

If public humiliation and the death of his mother weren’t reason enough, some suggest it was pure ambition; Mitsuhide may simply have wanted the power for himself, and he certainly wouldn’t have been the first to try it. Indeed, some historians speculate that if he had been able to prove that Nobunaga was actually dead, he might have gained some support, and the outcome could have been different.

Others suggest that Mitsuhide was a partisan of the Shogun, or possibly the Imperial Court, and overthrew Nobunaga in order to restore one or the other to power, though these ideas only emerged in the 20th century, and there’s little contemporary information to go on.

Nobunaga publicly beats Mitsuhide. Quite why Nobunaga treated him so poorly isn’t clear, but the humiliation almost certainly contributed to his decision to rebel.

There’s also the speculation that Mitsuhide was working with one of Nobunaga’s other vassals. Some historians argue that Hashiba Hideyoshi was able to turn his army against Mitsuhide very quickly, leading to speculation that he knew the attack was coming. Historians have never conclusively dismissed this, though it has been pointed out that only the fastest of Hideyoshi’s troops actually made it to the Battle of Yamazaki, meaning that the quick turnaround might not have been that quick after all.

Other theories blame the Imperial Court, or the Mori Clan, for conspiring against a man who had proven to be an existential threat, as well as the Buddhist Clergy, who had plenty of reason to want vengeance on Nobunaga.

A contemporary depiction of Mass. Though largely dismissed by historians, the possibility that the Jesuits feared Nobunaga would turn on them contributed to the theory that they were involved in his death.

Another possibility is the Jesuits, who are suggested to have feared that Nobunaga might move against them, though there’s little evidence that he intended to (as he valued foreign trade), and Hideyoshi, his ultimate successor, would prove to be a far greater threat to Christianity in Japan.

Ultimately, most of this speculation comes from later sources, and there’s no way to know what Mitsuhide intended, only that his plans fell apart before being decisively ended on the battlefield at Yamazaki.

Hashiba (later Toyotomi) Hideyoshi. His victory at Yamazaki did not make him Nobunaga’s successor, but it did wonders for his prestige.

Hashiba Hideyoshi’s victory did not mean he inherited Nobunaga’s power, however, and the power struggle that followed threatened to undo the Great Lord’s work, but that’s a story for another time.

Sources
https://ja.wikipedia.org/wiki/%E7%B9%94%E7%94%B0%E4%BF%A1%E9%95%B7
https://ja.wikipedia.org/wiki/%E6%9C%AC%E8%83%BD%E5%AF%BA%E3%81%AE%E5%A4%89
https://ja.wikipedia.org/wiki/%E6%95%B5%E3%81%AF%E6%9C%AC%E8%83%BD%E5%AF%BA%E3%81%AB%E3%81%82%E3%82%8A
https://ja.wikipedia.org/wiki/%E6%A1%82%E5%B7%9D_(%E6%B7%80%E5%B7%9D%E6%B0%B4%E7%B3%BB)
https://ja.wikipedia.org/wiki/%E4%BA%80%E5%B2%A1%E5%B8%82
https://ja.wikipedia.org/wiki/%E5%82%99%E4%B8%AD%E9%AB%98%E6%9D%BE%E5%9F%8E%E3%81%AE%E6%88%A6%E3%81%84
https://en.wikipedia.org/wiki/Honn%C5%8D-ji_Incident
https://en.wikipedia.org/wiki/Akechi_Mitsuhide
https://ja.wikipedia.org/wiki/%E5%B1%B1%E5%B4%8E%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E7%B9%94%E7%94%B0%E4%BF%A1%E5%BF%A0

If you are interested, the main source for this and the other posts on Oda Nobunaga is the 2011 translation of the Chronicle of Nobunaga, the Kindle version of which can be found here.

February 6, 2026
The First Unifier – Oda Nobunaga. Part Two.

In June 1565, the powerful Miyoshi Clan launched a coup against the Shogun, Ashikaga Yoshiteru. In the Eiroku Incident (named for the era), the Miyoshi successfully killed Yoshiteru, and his brother, Yoshiaki, a rival claimant to the throne, fled the capital, seeking support from regional warlords.

Miyoshi Yoshitsugu, one of the main leaders in the Eiroku Incident.

Nobunaga was initially enthusiastic about supporting Yoshiaki and the Shogunate more generally. Sources aren’t clear about Nobunaga’s ambitions at this point, with some arguing he genuinely wanted to restore the Ashikaga, whilst others portray it as cynical politicking, with Nobunaga intending to replace the Miyoshi’s puppet Shogun with his own.

Regardless, in the short term, military defeat limited Nobunaga’s practical aid, and it wasn’t until September 1568 that he formally recognised Yoshiaki as Shogun and dispatched an army to Kyoto to secure his accession to the throne. There was some resistance, but Nobunaga’s forces would prove triumphant, and Ashikaga Yoshiaki was installed as the 15th (and final) Ashikaga Shogun. It seems that Yoshiaki wanted to install Nobunaga as kanrei, or deputy, but he refused. Moreover, at this point, the Kyoto political community seemed to have viewed Nobunaga as little more than Yoshiaki’s general, rather than a political force in his own right.

Ashikaga Yoshiaki

In early 1569, Nobunaga once again proved his worth to the Shogunate by putting down an attempt by the Miyoshi Clan to restore their position in the capital. Shortly after that, Nobunaga issued the denchuonokite, or “Rules of the Palace”, which were a set of nine (with seven more added later) rules for the management of the Shogun’s court. For a long time, it was believed that these rules were the first clear example of Nobunaga imposing his will on the Shogunate, though later research suggests that Yoshiaki agreed to the rules, and it was only later that the relationship between the two men began to break down.

Nobunaga seems to have intended to return to his own territories after the restoration, serving as a sort of enforcer for the Shogun. However, by this point, the Shogunate was at such a low ebb that he found himself obliged to become closely involved in the running of the government. It has been suggested that the issuing of the “Palace Rules” was part of wider efforts by Nobunaga to reinforce the Shogunate, whilst also reining in the tendency of the Shogun to use his remaining power arbitrarily, favouring his own supporters at the expense of powerful clans elsewhere, who, Nobunaga (rightly) worried, would then become enemies of the Shogun, and be extension, himself.

Part of the original Palace Rules.

It was not as though Nobunaga had any trouble finding enemies of his own. In the late 1560s, his forces invaded Ise Province, and in 1570, he led an army north to Wakasa Province to subjugate the Asakura Clan, who had defied him. The invasion went well, but when word reached Nobunaga that the Azai Clan, led by his brother-in-law, had betrayed him, he was forced to retreat.

The reasons for this sudden betrayal have been much romanticised, with Azai Nagamasa sometimes portrayed as a principled opponent of Nobunaga’s tyranny, or else bound by a close alliance to the Asakura that trumped his loyalty to the Oda. Historians are still divided on the exact cause, but the betrayal was likely a combination of opportunism and genuine fear about Nobunaga’s intentions.

Nobunaga’s army was defeated at the Battle of Kanegasaki, with Nobunaga himself forced to flee the field. It is said that he was only able to escape because of the rearguard action led by Kinoshita Tōkichirō, who would later be known as Toyotomi Hideyoshi, and who was rewarded with gold by Nobunaga upon his return to Kyoto.

A later depiction of Hideyoshi in Nobunaga’s service. He first appears in records from the early 1560s, and by the time of Kanegasaki, he had earned a reputation as one of Nobunaga’s most capable subordinates.

Sources disagree on exactly how severe the defeat was; some state that Nobunaga returned to Kyoto with just ten men, whilst others put his army’s losses at fewer than 1300, out of a total of 30,000. Both numbers may be true, and it would certainly explain why Nobunaga himself seems to have remained calm in the wake of the defeat, inspecting the Imperial Palace the day after he returned to Kyoto.

Whilst Nobunaga had certainly been forced to retreat, the case for his army remaining largely intact is made by the fact that just a few months after Kanegasaki, he, along with his ally, Tokugawa Ieyasu, led a force of up to 40,000 men in a campaign against the Azai-Asakura, culminating in the Battle of Anegawa, which Nobunaga won, though he was unable to finish either the Azai or Asakura off, despite inflicting heavy casualties on both.

Nobunaga was prevented from pressing his advantage by events elsewhere. In August, the Miyoshi raised an army in Settsu Province (modern Osaka). Around the same time, the Ishiyama Hongan-ji Temple (on the site of modern Osaka Castle), fearing Nobunaga’s expansionist ambitions, raised an army of its own.

A model of Ishiyama Hongan-ji, showing it was far more than just a temple. Osaka Castle stands on the site today.
^{_{By Takafuji – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=77306876}}

All this was combined with the ongoing conflict with the Azai-Asakura alliance, and in September, supporters of Ishiyama Hongan-ji launched a rebellion in Ise Province in which Nobunaga’s younger brother, Nobuoki, was killed (or forced to commit seppuku) Faced with all this, Nobunaga chose to leverage his power at court, and in December, an Imperial decree was issued, ordering all sides to stop fighting, which they duly did, saving Nobunaga in the short-term.

Peace in the Age of the Country at War was only ever a fleeting thing, however. In February 1571, Nobunaga led an army of some 50,000 against the forces of Ishiyama Hongan-ji, resulting in one of his most controversial acts, the burning of Mt Hiei.

A semi-contemporary image of the burning of Mt Hiei, showing Nobunaga’s forces cutting people down as they try to flee the flames.

Mt Hiei is one of the most sacred sites in Japanese Buddhism, and in the late 16th Century, its monks were major political players in their own right, with influence at both the Imperial and Shogunate court, and an army of warrior monks to defend their interests. Nobunaga’s attack should be seen in this context, but it was also an incredibly shocking act, which outraged a Japanese political class that took its religion very seriously. One particularly outraged player was Takeda Shingen, who denounced Nobunaga and began a campaign against his ally, the Tokugawa.

Whilst historians suggest that Shingen’s outrage over Mt Hiei was just a pretext, the invasion of the Tokugawa home province of Mikawa was a serious threat to Nobunaga’s position. Shingen was arguably the most formidable warlord of his time, and may well have proved more than a match for Nobunaga. He was certainly too much for Tokugawa Ieyasu, who was obliged to retreat and call on Nobunaga for help.

Nobunaga dispatched a force of 3000 men to help, but they, along with the Tokugawa, were decisively defeated at the Battle of Mikatagahara in January 1573. Ieyasu himself barely managed to escape the disaster. In the aftermath, Nobunaga appeared vulnerable, so vulnerable that Ashikaga Yoshiaki, who had begun to chafe under Nobunaga’s regime, raised an army in opposition to him, presumably in the hope that Takeda Shingen was on his way.

A 19th-century depiction of the Battle of Mikatagahara. If Takeda Shingen had lived long enough to take advantage of the victory, the outcome of the Sengoku Jidai might have been very different.

Unfortunately for Yoshiaki, Shingen was dead. Though the circumstances of his death are still murky, it ended a serious threat to Nobunaga, perhaps the most serious threat, and he was able to focus his forces on Kyoto, where he swiftly forced Yoshiaki to make peace and resume his position firmly under Nobunaga’s thumb.

Yoshiaski refused to learn his lesson, however, and a second rebellion broke out not long after, with Shogunate loyalists barricading themselves inside Makishima Castle, which Nobunaga swiftly took, sending Yoshiaki into exile, and effectively bringing an end to the Ashikaga Shogunate, once and for all. Historians debate whether the Shogunate actually ended at this time, as Yoshiaki continued to use the title, and would spend the next few years roaming Japan seeking support to overthrow Nobunaga.

What is true, though, is that the Ashikaga, long in decline, would never rule from Kyoto again. There had been strongmen before, of course, but they had always ruled through puppet Shoguns, and the institution had remained largely intact. Nobunaga did away with that; though he would never take the title of Shogun for himself, from 1573 until his death, Nobunaga sat at the top of a very precarious pile.

Nobunaga’s territory is in red, in the centre, surrounded by enemies, or opportunities, depending on your perspective.
_{^{By Alvin Lee – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39200929}}

Sources
https://ja.wikipedia.org/wiki/%E7%B9%94%E7%94%B0%E4%BF%A1%E9%95%B7
https://ja.wikipedia.org/wiki/%E4%B8%89%E6%96%B9%E3%83%B6%E5%8E%9F%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E6%AF%94%E5%8F%A1%E5%B1%B1%E7%84%BC%E3%81%8D%E8%A8%8E%E3%81%A1_(1571%E5%B9%B4)
https://ja.wikipedia.org/wiki/%E7%B9%94%E7%94%B0%E4%BF%A1%E8%88%88
https://ja.wikipedia.org/wiki/%E9%95%B7%E5%B3%B6%E4%B8%80%E5%90%91%E4%B8%80%E6%8F%86
https://ja.wikipedia.org/wiki/%E5%BF%97%E8%B3%80%E3%81%AE%E9%99%A3
https://ja.wikipedia.org/wiki/%E5%A7%89%E5%B7%9D%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E9%87%91%E3%83%B6%E5%B4%8E%E3%81%AE%E6%88%A6%E3%81%84#%E6%88%A6%E5%BE%8C
https://ja.wikipedia.org/wiki/%E8%B1%8A%E8%87%A3%E7%A7%80%E5%90%89
https://ja.wikipedia.org/wiki/%E6%B5%85%E4%BA%95%E9%95%B7%E6%94%BF
https://ja.wikipedia.org/wiki/%E6%AE%BF%E4%B8%AD%E5%BE%A1%E6%8E%9F
https://ja.wikipedia.org/wiki/%E8%B6%B3%E5%88%A9%E7%BE%A9%E6%98%AD
https://ja.wikipedia.org/wiki/%E6%9C%AC%E5%9C%80%E5%AF%BA%E3%81%AE%E5%A4%89
https://ja.wikipedia.org/wiki/%E6%B0%B8%E7%A6%84%E3%81%AE%E5%A4%89
https://ja.wikipedia.org/wiki/%E4%B8%89%E5%A5%BD%E7%BE%A9%E7%B6%99
https://ja.wikipedia.org/wiki/%E8%B6%B3%E5%88%A9%E7%BE%A9%E6%A0%84
https://ja.wikipedia.org/wiki/%E4%B8%89%E5%A5%BD%E4%B8%89%E4%BA%BA%E8%A1%86
https://en.wikipedia.org/wiki/Ishiyama_Hongan-ji

January 23, 2026
The Odawara Campaign

Just a quick note from me: Due to real-life changes with workload, I’ve decided to reduce the number of blog posts to one per week. Going forward, the blog will be posted on Fridays.

In 1589, the Hojo openly defied Toyotomi Hideyoshi’s peace orders, prompting the new regent to declare them in rebellion against the throne. (Side note, Hideyoshi, as the son of a peasant, couldn’t be declared Shogun, so he took the title of Kampaku, officially the chief advisor of the Emperor, but in reality, the political master of Japan.)

Toyotomi Hideyoshi

There were some final (and quite half-hearted) attempts at negotiation, but Hideyoshi’s position was clear: either the Hojo would submit, or they would be destroyed. The Hojo, an old, proud, and powerful clan, refused to bow, and by 1590, Hideyoshi had mustered an army of some 200,000 men to force the issue.

Tokugawa Ieyasu, whose lands lay between the Hojo and Hideyoshi, initially sought to mediate, as his daughter was married to Hojo Ujinao, the nominal lord of the clan. These attempts failed, however, and Ieyasu threw in his lot with Hideyoshi, making preparations in his lands for the movement of thousands of troops advancing on the Kanto.

The Kanto is surrounded by mountains and, at least in theory, very easy to defend, as there are only a limited number of passes through which a large body of troops can pass. The Hojo knew this and fortified as many of these passes as they could. Unfortunately, they were now being attacked on practically all sides. As well as the Tokugawa-Toyotomi force coming from the east, they also face an army sent along the Nakasendo road to attack Usui Pass in the north, and a force dispatched from the North-East would advance into Musashi Province and attack the castles there. Even the ocean to the south wasn’t open to the Hojo, as a naval force attacked Nagahama Castle in Izu.

The site of Nagahama Castle today.

The main blow would come from the west, however, as Hideyoshi led his army in an attack on the apparently formidable fortress of Yamanaka. Before the outbreak of hostilities, the Hojo had dispatched a garrison of 4000 men to the castle and set about improving its fortifications. Unfortunately, this work was not completed by the time Hideyoshi’s army arrived, and, despite its reputation as the “gateway” to the Kanto, Yamanaka fell in a single morning, despite brave resistance from the overmatched garrison.

Other castles in the area were taken or besieged, bottling up their garrisons and preventing them from supporting the main attack on Odawara, which itself came under siege in early May. Odawara itself was an enormous castle, and despite the size of Hideyoshi’s army, there was no serious attempt to take it by storm. Instead, the siege camp became something of a small town, with everything from prostitutes to theatrical troupes plying their trade amongst the besiegers, whilst the Hojo defenders were often obliged to sleep on the battlements in their armour, for fear of a sudden attack.

With Odawara now firmly under siege, Hideyoshi was confident enough to dispatch forces to support the campaigns in other parts of Hojo territory, with many of the castles falling with surprising speed. This was largely due to the fact that the Hojo had mobilised the vast majority of their forces for the defence of Odawara itself, leaving most of the outlying castles only lightly defended. When faced with the overwhelming strength of the forces arrayed against them, most of these castles surrendered immediately, or else were taken after only brief resistance.

The layout of Odawara Castle.

There is some evidence that the speed at which many of these castles fell led Hideyoshi to criticise his generals in the region, suggesting that taking so many castles so easily could not be considered a military achievement.

The ease of the advance wasn’t true everywhere, however. At Iwatsuki (in modern Saitama), a force of 20,000 was held up by the defenders for several days despite a numerical advantage of 10-1. When the castle fell, Hideyoshi ordered that all the fighting men be killed, and the women and children taken prisoner. Instead, the commanding general, Asano Nagamasa, had already agreed to spare the surviving warriors, the women and the children as part of the surrender agreement.

Meanwhile, the Siege at Hachigata Castle (also in Saitama) concerned Hideyoshi enough that he sent a sternly worded letter to Nagamasa, ordering him to focus his efforts there. Nagamasa did so, and a combined army of some 35,000 men attacked Hachigata, forcing the garrison to surrender. Once again, arrangements were made to spare the garrison and non-combatants, though this time it doesn’t seem to have been in defiance of Hideyoshi’s orders.

The site of Hachigata Castle as they appear today.
_{^{Taketarou – 投稿者自身による著作物, CC 表示-継承 3.0, https://commons.wikimedia.org/w/index.php?curid=1273726による}}

While most castles were taken by force, negotiation, or a combination of the two, some held out, either through the skill of their defenders or, as was the case at Tatebayashi Castle, by apparently divine intervention. The castle was apparently founded with the help of a grateful fox, who rewarded the lord of the castle for rescuing its baby by marking out the foundations of the fortress in an area of swampy ground.

This soggy position made the castle very difficult to approach, and when it came under siege, the attackers laid down logs across the swamp to create a roadway to the castle walls. With their pathway secure, the besiegers got a good night’s rest and prepared for a dawn attack. When the sun rose, they found that the roadway had disappeared completely, something put down to the fox spirit protecting the castle rather than the possibility that the logs had just sunk.

Another famous, watery siege was that of Oshi Castle. Surrounded on two sides by rivers, Oshi was besieged by forces led by Ishida Mitsunari (who will become very important). Much ike Tatebayashi, Oshi’s watery position made it difficult to overcome. Mitsunari (apparently on written instructions from Hideyoshi) set about building an enormous levee surrounding the fort, forcing the water from the two rivers to inundate the castle and flood out its defenders.

The levee (Ishida Tsutsumi) as it appears today in modern Konosu, Saitama.
_{^{京浜にけ – 投稿者自身による著作物, CC 表示-継承 3.0, https://commons.wikimedia.org/w/index.php?curid=100409931による}}

To the besiegers’ surprise, the waters didn’t actually flood the castle; instead, they gave it the appearance of floating on the water, leading it to be referred to as the “Floating Castle” (this is the title of a manga and its later 2012 adaptation, both about the siege). Following several days of heavy rain, the levee broke (or was sabotaged in some sources), flooding the siege camp and killing up to 200 warriors.

The failure of this approach would seriously damage Mitsunari’s military reputation (some sources point out that he was just following Hideyoshi’s instructions, but the damage was done), and the siege was eventually taken over by Asano Nagamasa. An all-out assault on the castle was impossible due to the effects of the flooding, which had turned the ground into an impassable quagmire, and Oshi has the distinction of being one of the few fortresses that held out until the end of the Odawara Campaign, before eventually surrendering nearly 2 weeks after the fall of Odawara.

Odawara, as one of the most formidable castles in the realm, hadn’t come under direct attack, but the siege had been dragging on for weeks, and news from other parts of the Kanto was almost universally bad, sapping the already fragile morale of the defenders. Shortly after the siege began, the loyalty of the Date Clan was still in doubt, and the Hojo held out hope that they might receive aid from outside the Kanto. Date forces indeed entered the Kanto, but in support of Hideyoshi, ending any hope of relief.

Date Masamune. His decision to support Hideyoshi ended any hope the Hojo had of outside support.

Though no general assault was launched, there were a few small-scale skirmishes and sporadic gunfire, and by early summer, signs of a breakdown in morale were appearing on both sides, with an increase of desertion amongst the besiegers, and the ever-present possibility of defection from the Hojo, especially as news of the rapid fall of other castles arrived.

Negotiations began early in the siege, largely facilitated by Tokugawa Ieyasu, Hojo Ujinao’s father-in-law. Rumours of a peace agreement spread almost immediately, and Ujinao’s grandmother and step-mother (Ujimasa’s second wife) both died mysteriously on the same day. Historians generally believe they committed suicide, either in protest of a peace deal or in prospect of one.

News of the fall of other fortresses was followed by the public display of the heads of those killed, and then the wives and children of the survivors outside the castle walls, further depleting the defenders’ morale. Towards the end of the siege, the appearance of Ishigakiyama Castle, built in just a few months, on a mountain not far from Odawara, effectively ended what remained of the Hojo’s will to resist.

Odawara Castle as seen from Ishigakiyama.

A side note here, there is a popular legend that Ishigakiyama Castle was ‘built in one night’, which was clearly impossible, with later sources suggesting that rather than literally being built overnight, the castle was instead constructed behind a forest, which was itself cut down overnight, giving the impression that the castle had appeared from nowhere. Modern scholars doubt that either version is true, as Ishigakiyama is easily visible from Odawara, and though the castle was certainly built unusually quickly, it is now thought to have been constructed in full view of the Hojo, to highlight the impossibility of their situation.

After this, the besiegers made a point of keeping up a light but continuous rain of gunfire on the castle, intending to grind down their morale, and when a final, furious night attack from the castle was repelled in August, the writing was on the wall, and a delegation from the Hojo was sent out to offer the seppuku of Hojo Ujinao and the surrender of the castle, in exchange for the lives of the remaining garrison.

Hideyoshi accepted the surrender of the castle on the condition that all the remaining senior Hojo, Ujinao, his father Ujimasa, and uncle Ujiteru, commit seppuku, and that the provinces of Musashi, Sagami, and Izu (the Hojo heartlands) be given up. Further resistance was now impossible, and the Hojo agreed. Tokugawa Ieyasu successfully intervened for the life of his son-in-law, Ujinao, but he would fall sick (possibly with smallpox) and die by the end of the year.

Hojo Ujinao.

In the aftermath of the fall of Odawara, the Kanto would come under the control of Tokugawa Ieyasu, who had previously agreed to trade his three home provinces for the five of the Kanto, making his new base at Edo Castle, the site of the modern Imperial Palace in Tokyo. In the long-term, this would prove to be a genius move on Ieyasu’s part, but for now, the man who came out on top was Toyotomi Hideyoshi.

With the Hojo defeated, there were no longer any serious rivals to his rule. For the first time in more than a century, the realm was united under a single, undisputed leader, who set about ensuring it would never again fall into chaos.

The situation after the fall of Odawara. No more division, no more chaos, at least on paper.
_{^{By Alvin Lee – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39214210}}

Hideyoshi’s conquest of Odawara marked the end of the second phase of Japan’s reunification. Next week, we’ll take a step back to look at another name we’ve mentioned a lot, Oda Nobunaga, the first of the great unifiers.

Sources
https://ja.wikipedia.org/wiki/%E6%83%A3%E7%84%A1%E4%BA%8B%E4%BB%A4
https://ja.wikipedia.org/wiki/%E5%B1%B1%E4%B8%AD%E5%9F%8E
https://ja.wikipedia.org/wiki/%E5%B0%8F%E7%94%B0%E5%8E%9F%E5%BE%81%E4%BC%90
https://ja.wikipedia.org/wiki/%E7%9F%B3%E5%9E%A3%E5%B1%B1%E5%9F%8E
https://ja.wikipedia.org/wiki/%E5%BF%8D%E5%9F%8E%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E5%BF%8D%E5%9F%8E
https://ja.wikipedia.org/wiki/%E7%9F%B3%E7%94%B0%E5%A0%A4
https://ja.wikipedia.org/wiki/%E9%A4%A8%E6%9E%97%E5%9F%8E
https://ja.wikipedia.org/wiki/%E5%B2%A9%E6%A7%BB%E5%9F%8E
https://ja.wikipedia.org/wiki/%E6%B5%85%E9%87%8E%E9%95%B7%E6%94%BF
https://ja.wikipedia.org/wiki/%E9%89%A2%E5%BD%A2%E5%9F%8E
https://ja.wikipedia.org/wiki/%E9%9F%AE%E5%B1%B1%E5%9F%8E
https://ja.wikipedia.org/wiki/%E9%95%B7%E6%B5%9C%E5%9F%8E_(%E4%BC%8A%E8%B1%86%E5%9B%BD)
https://ja.wikipedia.org/wiki/%E6%9D%BE%E4%BA%95%E7%94%B0%E5%9F%8E
https://en.wikipedia.org/wiki/Toyotomi_Hideyoshi
https://en.wikipedia.org/wiki/Siege_of_Odawara_(1590)

January 9, 2026
Lords of the East, Part 4

Hojo Ujiyasu died in 1571, having lived a life in which he had seen the fortunes of his clan rise, fall, and then rise again. His son, Ujimasa, inherited a strong but still dangerous position. Almost as soon as his father had passed, Ujimasa sought to end the war with Takeda Shingen and reestablish an alliance against their mutual enemy, Uesugi Kenshin.

Hojo Ujimasa

Shingen, by now in control of Suruga and stronger than ever, agreed, and it didn’t take long for the Hojo and Uesugi to be at each other’s throats again. In 1574, Kenshin invaded the Kanto, but his attention was focused mostly on his conflict with the Takeda, closer to home, and this round of Uesugi-Hojo fighting ended after an indecisive battle at the Tone River.

With Kenshin busy elsewhere, Ujimasa turned his attention back to the Hojo’s old enemy, the Satomi, invading Shimotsuke in 1576, and advancing deep into Kazusa the next year. The Hojo clearly had the military advantage, with a vastly superior army and much larger territory. Despite this, the terrain of Kazusa and Awa Province (in the south of modern Chiba) is difficult for military operations, and Hojo supply lines relied either on ships crossing Tokyo Bay, which was difficult even in good weather, or on taking the long way around through Musashi Province (modern Tokyo).

The terrain of Kazusa and Awa as it appears today. Though the Hojo were stronger, the logistical reality made a long term campaign impossible.
_{^{By certified, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=55415779}}

Neither of these options was particularly appealing, and what was more, the number of troops that the Hojo would have needed to commit to ending the war decisively would have left their other frontiers unacceptably vulnerable. So, in late 1577, a peace agreement (the Boso Ichiwa) was reached, establishing the border between the two factions and arranging a marriage to seal the deal.

Although the marriage would end within a few years, with the death of Ujimasa’s daughter, the peace held (more or less). This is demonstrated by the fact that when civil war broke out among the Satomi following Yoshihiro’s death in 1578, the Hojo did not intervene, even though it would have been to their advantage to do so. The peace would eventually come to an end in 1590, but we’re getting ahead of ourselves.

Uesugi Kenshin, one of the Hojo’s most dangerous foes, also died in 1578, and Uesugi, much like the Satomi, quickly fell into infighting over who would succeed him. This time, the Hojo made some attempts to intervene, as Uesugi Kagetora, one of the candidates, was Ujimasa’s younger brother, who had been adopted by Kenshin as part of the earlier peace deal. Ujimasa’s support for his one-time brother seems to have been quite limited, however, as Hojo forces contented themselves with securing control over Kozuke Province before withdrawing.

Takeda Shingen had died in 1573, and with the Uesugi and Satomi tearing themselves apart over succession, by 1578, Ujimasa might have been forgiven for thinking that he’d ‘won’ in the Kanto. Unfortunately for him, Shingen’s death led to the disastrous Battle of Nagashino in 1575, in which the Takeda clan’s power was broken, leaving the western approaches to the Kanto open to a new, and far more dangerous, player.

Oda Nobunaga.

Oda Nobunaga had risen from obscure origins in Owari Province (around modern Nagoya) to become the preeminent lord in the realm. Though his power was not yet completely unchallenged, by 1578, he was best placed to be the man who would unite the realm and end the Sengoku Jidai. With that in mind, Ujimasa reached out diplomatically, seeking to gain Nobunaga’s favour and perhaps arrange a marriage between the Oda and Hojo. Around this time, he also seems to have ‘retired’ and given control of the clan to his son, Ujinao, whilst in reality retaining actual power for himself.

For his part, Nobunaga seems to have had little interest in a rapprochement with the Hojo, though his exact plans aren’t clear; it’s reasonable to assume that, much like the Takeda, Nobunaga viewed the Hojo as a rival to eventually be crushed. However, in the short term, he had more pressing concerns in the West, dealing with the powerful Mori Clan, and for now, the Hojo were left alone.

With Nobunaga’s death in June 1582, everything changed. Taking advantage of the chaos, Ujimasa launched an attack against former Oda loyalists in the Kanto, securing control of the whole of Kozuke Province, and advancing into Kai, where he was met by another power seeking to take advantage of Nobunaga’s death, Tokugawa Ieyasu.

Tokugawa Ieyasu

The fighting didn’t go well for the Hojo, but neither side was committed to all-out war, so a peace was agreed upon, which saw Ujimasa’s son, Ujinao, marry Ieyasu’s daughter, Tokuhime. In 1583, following the death of the last Ashikaga Kanto kubo, Ujimasa took the title for himself, positioning the Hojo at the very top of the hierarchy in the Kanto.

Not long after that, a successful campaign in support of allies in Shimotsuke Province brought the southern half of that province under his control, and Hojo territory reached its greatest extent. By some later estimates, the territory was valued at 2.4 Million Koku, and with control of several key rivers and coastal areas, the Hojo now dominated the political, military, and economic spheres within the Kanto.

In 1587, the chaos that had followed Nobunaga’s death had come to an end, with Toyotomi Hideyoshi emerging as the ultimate winner. That year, he issued the Soubujirei or “General Peace Order” commanding that all Daimyo cease private wars, essentially bringing an end to the Sengoku Jidai, at least on paper.

Toyotomi Hideyoshi

The Hojo agreed to abide by this order, but there was one outstanding issue. During the fighting in Kai Province in 1582, the Numata Domain, territory of the Sanada Clan, had defied Hojo attempts to conquer it. Though the fighting had largely come to an end, the border remained undefined, and so Hideyoshi dispatched vassals to settle the issue.

Hideyoshi’s decision was that two-thirds of the territory would go to the Hojo, and the remaining third would remain in Sanada hands. To confirm the arrangement, the powerful Numata Castle was handed over to the Hojo and peace was apparently agreed. However, shortly after this, the new lord of Numata arranged for the defection of nearby Nagurumi Castle, on the Sanada side of the border.

The site of Nagurumi Castle today.
_{^{photo: Qurren (トーク) Taken with Canon PowerShot G9 X – 投稿者自身による著作物, CC 表示-継承 3.0, https://commons.wikimedia.org/w/index.php?curid=63097035による}}

The plot succeeded, and Nagurumi was handed over to Hojo forces without a fight. The problem was that this was a clear violation of the peace deal, and things only got worse when Ujinao denied any knowledge of the plot in a letter to Hideyoshi, attempting to present the capture of the castle as a fait accompli.
Hideyoshi wasn’t about to accept that, and demanded that Ujimasa (retired, but still effective head of the clan) come to Kyoto to explain his clan’s actions.

Ujimasa refused, and Hideyoshi took this as an act of open rebellion. In 1589, he ordered all lords to attack the Hojo as punishment for their defiance. Initial attacks from the Sanada clan were repelled by Hojo forces, but Hideyoshi was able to muster a force in excess of 200,000 men, and when the main attack began, it would be a fight to the death.

The Odawara Campaign is deserving of a post of its own, I think, so we’ll leave it there for now.

Sources
https://ja.wikipedia.org/wiki/%E5%8C%97%E6%9D%A1%E6%B0%8F%E6%94%BF
https://ja.wikipedia.org/wiki/%E8%B1%8A%E8%87%A3%E7%A7%80%E5%90%89
https://ja.wikipedia.org/wiki/%E5%B0%8F%E7%94%B0%E5%8E%9F%E5%BE%81%E4%BC%90
https://ja.wikipedia.org/wiki/%E5%90%8D%E8%83%A1%E6%A1%83%E5%9F%8E
https://ja.wikipedia.org/wiki/%E6%83%A3%E7%84%A1%E4%BA%8B%E4%BB%A4
https://ja.wikipedia.org/wiki/%E5%8C%97%E6%9D%A1%E6%B0%8F%E5%BA%B7

January 6, 2026
Kings in the North, Part 3

Last time, we looked at how Date Masamune defied an order from Toyotomi Hideyoshi to end his local wars. In 1590, the Date were summoned to take part in the upcoming campaign against the Hojo, based at Odawara, and Masamune knew better than to push his luck. Hideyoshi, however, had not forgotten his earlier defiance.

Date Masamune

When Masamune arrived at Odawara, he was stripped of all the territory he had taken in Aizu and confined to the 13 counties in Mutsu and Dewa Provinces that the Date had controlled before the peace order, obliging Masamune to leave the recently conquered Kurokawa Castle and return to his family’s seat at Yonezawa. In 1591, a rebellion broke out in Masamune’s home province, and after he put it down, letters were ‘found’ that implicated Masamune in instigating the violence.

The rumours reached Hideyoshi in Kyoto, and he ordered Masamune to come in person to explain himself, which he promptly did, eventually being pardoned, but having his territory reduced still further. Despite the fact that Masamune then fought in Hideyoshi’s invasion of Korea, it wasn’t long before further rumours of treason surrounded him.

In 1595, Hideyoshi’s nephew, Hidetsugu, was accused of treason, allegedly plotting either to overthrow his uncle or else usurp the regency after his death. Even at the time, the accusations were considered dubious, and the exact reasons are still murky today, but Hidetsugu was obliged to commit seppuku, and 39 members of his family and household were purged (read, murdered).

Toyotomi Hidetsugu. The accusations of his treasonous conduct were considered dubious even at the time.

The brutality of the crackdown and the somewhat flimsy evidence would eventually backfire for Hideyoshi, but for now, we can focus on how this purge would eventually involve Masamune. He and Hidetsugu had enjoyed a close relationship, and when accusations of treason were being thrown around, it didn’t take long for people to point that out.

Masamune was summoned to explain himself once again. He had good reason to worry; his cousin had been Hidetsugu’s concubine (and had died in the purge), and it was widely thought that Hideyoshi believed that Masamune was guilty. In the end, a combination of Masamune’s eloquent denial and the intervention of several influential retainers led to his pardon. He was, however, obliged to sign a document, witnessed (and potentially enforced) by 19 powerful vassals, stating that if he were ever to commit treason, his position as head of his clan would be forfeit.

Hideyoshi died in 1598, leaving his young son in the care of a council of five regents. Masamune was not on this council, but he quickly reached an understanding with Tokugawa Ieyasu, arguably the council’s most powerful member. In 1599, Masamune’s daughter married Ieyasu’s fifth son, something that was believed to be an example of Ieyasu securing illegal alliances, though modern scholars suggest that this is an example of a violation of the ‘spirit’ rather than the letter of the law.

Tokugawa Ieyasu. He found a willing ally in Masamune.

By 1600, it had become clear that the Council of Regents was not going to last, and a new conflict swiftly broke out. Ieyasu secured the support of Masamune by promising to restore all the lands he had lost in 1590. Date forces would not be present at the decisive Battle of Sekigahara, however, and despite some successes against Ieyasu’s enemies in the north, an attempt to retake the promised territories by force was ultimately unsuccessful.

Despite this, Masamune still petitioned Ieyasu for the return of the territory, which Ieyasu refused to do, and in fact, Date lands were reduced further (though they would remain the fifth richest clan by koku (rice production)). In 1601, Masamune moved his headquarters to Sendai, establishing the Sendai Domain, which would continue to be the centre of the Date Clan for the next 250 years.

Though distant from the capital and never entirely trusted, Masamune would play a significant role in Japan’s future. In 1613, he ordered the construction of a European-style galleon, the San Juan Bautista. Masamune was the only Daimyo to receive permission from the Tokugawa to send missions overseas to represent Japan. The so-called Keicho Embassy departed Japan in October 1613, travelling across the Pacific to New Spain (modern Mexico) and from there, across the Atlantic to Europe. The embassy would receive an audience with the King of Spain in January 1615, and then one with the Pope in October of the same year. The Embassy would not return to Japan until 1620, by which time Christianity had been outlawed by the Shogunate, meaning that the Ambassador and anyone involved had come under suspicion.

A European portrait of Hasekura Tsunenaga, the ambassador in the Keicho Embassy. By the time he returned to Japan, Christianity had been outlawed, and his achievement as the first Japanese representative to Europe was largely forgotten.

Meanwhile, Masamune at the Date had continued to support the new Shogunate, taking part in both Sieges of Osaka in 1614-15. However, once again, Masamune would find himself under attack by rumours of treason, this time after a supposed ‘friendly fire’ incident, in which Date troops fired on their allies. It’s not clear from surviving records if this incident actually happened, but in 1616, the rumour spread that Ieyasu planned to march against the Date.

When the two men met in early 1616, Masamune was cleared of any suspicion, and after Ieyasu passed away in June of that year, any serious suggestion that the Date and Tokugawa would go to war seems to have died out (though later texts suggest that Masamune had a plan to fight the Shogunate, should it come down to it)

With the age of constant civil war coming to an end, Masamune focused on developing his home territory. He ordered the construction of a canal that became the Teizan Canal (though it wouldn’t take its final form until the 19th century). He established a port at Ishinomaki, which was heavily damaged in a tsunami in 2011, and has since been largely rebuilt.

The Teizan Canal as it appears today. Though largely remodelled in the 19th century, its origins lay with Masamune in the 1600s.

He also developed agriculture in the Kitakami River basin, which remains a major rice producer to this day. In the Edo Period, the Sendai Domain was valued at around 620,000 koku, but produced in excess of 745,000 koku annually, indicating how effective Masamune’s investments had been, and how inefficient Japanese land valuation was in the pre-modern period.

In his later years, Masamune would establish a warmer relationship with the Shogunate than he had known previously. When the third Shogun, Iemitsu, began to rule in his own right in 1632, he was said to have idolised Masamune, who by then was one of the last remaining Daimyo to have actually fought during the Sengoku period. The Shogun is said to have frequently asked Masamune for stories of the period, especially the battles he had fought, and what it had been like to serve Ieyasu and Hideyoshi (both of whom were legendary figures by that point)

Masamune remained vigorous until late in life, but in 1634, he began to develop serious health problems, and his condition declined quickly before he eventually passed away in June 1636. His death was mourned in Edo, with the Shogun banning revelry, fishing, and even the playing of music for seven days afterwards.

Zuihoden, in modern Sendai, the final resting place of Date Masamune.
_{^{663highland 投稿者自身による著作物, CC 表示 2.5, https://commons.wikimedia.org/w/index.php?curid=2631054による}}

Masamune’s reforms and investments had left the Date in a strong financial position, and the Clan would often be treated generally by the Shogunate, with the clan being one of the few ‘outside’ Daimyo (a clan that had not been a vassal of the Tokugawa before Sekigahara) who was granted a marriage into the Shogun’s family.

Despite, or perhaps because of this, the third Lord, Tsunamune (Masamune’s grandson), proved to be something of a “rich kid” spending his days engaged in what is politely called “debauchery”. Although a certain amount of wine, women (or men), and song was expected of a Daimyo, Tsunamune was extreme to the point that his retainers tried to get rid of him. In August 1660, they petitioned the Shogunate directly, asking that Tsunamune be removed.

The Shogunate agreed, replacing Tsunamune with his two-year-old son, Tsunamura. Given his young age, Tsunamura needed a regent, and what followed was a decade of violence as rival factions sought influence over the young Lord. Finally, in 1671, a meeting was called in the house of Sakai Tadakiyo, a roju (senior minister) in Edo.

Date Tsunamune, whose debauchery led to his downfall, and nearly that of his clan.

What was supposed to be a peaceful meeting to seek a solution to the ongoing violence in Sendai quickly turned into a bloody brawl, and by the end of it, swords had been drawn, and several men lay dead. Tsunamune, as a child, was not held responsible, but the families of those responsible for the bloodshed were executed in turn (in line with the law at the time).

As the Edo Period went on, the Sendai Domain, much like many Samurai holdings, began to suffer economic hardship. The problem was that the value of the land was estimated based on rice production in the 17th century, and by the early 19th century, those numbers simply didn’t add up.

Financial problems didn’t stop the Date from remaining loyal to the Tokugawa; during the Boshin War in 1868-69, the Sendai Domain was central to the Shogunate’s efforts to retain power. The Shogunate would ultimately lose the war, and the Date had their lands confiscated, though they were partially restored in the peace that followed. With the abolition of the domains, the Date joined the new aristocracy and continued to serve the new Meiji regime into the 20th century.

Date Munemoto, the last lord (and first governor) of the Sendai Domain.

The Date were not always on the right side of the law, however. One infamous member of the clan was Junnosuke, who was known for carrying a knife to school and, in 1909, was sentenced to 12 years in prison for shooting a fellow student during a brawl. His sentence was eventually suspended when his lawyer ‘proved’ it was self-defence. In 1916, he left Japan for Manchuria (not yet under Japanese rule at that point), where he joined the Manchurian Independence Movement.

He had a varied career after this, serving in the Border Guards in Korea (then under Japanese control), but in 1923, he seems to have been operating as little more than a bandit in and around the Shandong Peninsula. In 1931, he became a naturalised Chinese citizen, but in 1937, he was at the head of some 4000 soldiers from Manchukuo and took part in the Japanese invasion of China; however, his unit was disbanded in 1939. After the war, he was caught by the Chinese, tried as a war criminal, and shot in 1948, bringing a violent career to a violent end.

Date Junnosuke in the uniform of a Border Guard.

In the interest of ending things on a lighter note, another descendant of the Date clan (a branch of it, anyway) is Date Mikio, one half of the famous comedy duo Sandwichman, who have won many awards and are arguably one of Japan’s most prolific duos, so that’s nice.

The main branch of the Date Clan survives into the modern era as well, with the current head, Date Yasumune, serving as a curator of the Zuihoden Museum, burial place of Date Masamune, and a repository for numerous artefacts related to the clan.

Sources
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E9%A8%92%E5%8B%95
https://en.wikipedia.org/wiki/Date_S%C5%8Dd%C5%8D
https://ja.wikipedia.org/wiki/%E6%96%B0%E7%99%BA%E7%94%B0%E9%87%8D%E5%AE%B6
https://en.wikipedia.org/wiki/Date_Masamune
https://en.wikipedia.org/wiki/Tokugawa_Ieyasu
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E7%B6%B1%E5%AE%97
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https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E6%B3%B0%E5%AE%97
https://ja.wikipedia.org/wiki/%E3%82%B5%E3%83%B3%E3%83%89%E3%82%A6%E3%82%A3%E3%83%83%E3%83%81%E3%83%9E%E3%83%B3_(%E3%81%8A%E7%AC%91%E3%81%84%E3%82%B3%E3%83%B3%E3%83%93)
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E5%AE%97%E5%9F%BA

December 23, 2025
Kings in the North, Part 2

This is the 50th post on this blog. Well done for getting this far.

In 1565, Date Harumune retired and handed control of the clan over to his son Terumune. Despite this, Harumune held onto the real power, and it wasn’t until 1570, when Terumune accused several of his father’s supporters of treason and had them removed, that he gained actual power.

Date Terumune

Despite this, Terumune continued most of his father’s policies, especially in diplomacy. The alliance with the Ashina Clan was maintained, and Date diplomats reached out to the Hojo, Oda, and Shibata Clans, establishing friendly relations with several of Japan’s most powerful warlords. The Sengoku in Sengoku Jidai literally means ‘country at war’; however, alongside his diplomatic efforts, Terumune showed he wasn’t afraid to throw his weight around if an opportunity presented itself.

In 1578, the death of Uesugi Kenshin presented just such an opportunity, and Terumune dispatched forces to intervene in the internal struggle that followed. The Date intervention was ultimately unsuccessful, largely due to the military skills of the Shibata Clan, vassals of the Uesugi, who fought off the Date in several engagements.

Frustrated, Terumune withdrew, but the Shibata had apparently expected more generous rewards for their service, and in 1581, when it was clear that they would not beforthcoming, the Shibata rebelled. Terumune dispatched his army once again, this time in support of the Shibata, and the conflict within the Uesugi Clan would drag on for years.

Shibata Shigeie, one of the Shibata brothers who gave the Date so much trouble.
_^さどこ – _{^{http://blog.livedoor.jp/sadosado_4hi/archives/8412806.html, CC 表示-継承 4.0, https://commons.wikimedia.org/w/index.php?curid=99877267による}}

Closer to home, the long war against the nearby Soma Clan continued into Terumune’s reign. The Soma were based in southern Mutsu Province (the area of modern Fukushima Prefecture) and had proven to be tenacious opponents of the Date, with neither side ever able to establish a permanent advantage over the other, despite decades of conflict.

In the period of 1582-84, however, the Date finally managed to overcome the Soma. Although the latter clan was not completely subdued, the strategic situation compelled them to make peace in 1584, with the border between the two clans agreed upon by treaty.

Also in 1584, the long-time allies of the Date, the Ashina Clan, fell prey to an internal power struggle, after their lord, Moritaka, was murdered by a retainer (the official reason is said to be ‘due to sodomy’, so make of that what you will). The new head of the clan was just a month old, and so the Ashina were effectively subordinate to the Date, despite nominally remaining independent.

Shortly after this, Terumune retired, handing leadership over to his son, Masamune. Sources disagree on the exact reason for this, with some suggesting that Terumune planned to make his second son head of the Ashina, only to encounter serious opposition from within the Ashina and his own clan, who then forced him to abandon the idea and retire in disgrace. Other sources say that Terumune learned a lesson from the fate of the Ashina and decided to hand over the leadership of the Date to his son while he was still alive, rather than leave the succession to chance.

Date Masamune

Regardless of the reason, Masamune became head of the clan in 1585, and immediately set out to prove that he was not going to do things the same way as his father had. Whilst Terumune had intended to continue the war against the Uesugi, along with his Ashina and Mogami allies, Masamune made peace, without consulting either clan, leading to a sudden and serious decline in relations.

Masamune would definitively end the alliance shortly afterwards when he invaded Ashina territory, which the Ashina, unsurprisingly, interpreted as a hostile act. The invasion would prove to be a back-and-forth affair, with the Ashina successfully repelling the Date’s first attacks only to be defeated by a second wave, led by Masamune himself.

In late 1585, the Ashina asked for a truce, and a peace was mediated by Terumune and his uncle, Sanemoto. The negotiations would prove to be a ruse, however, as Ashina forces kidnapped Terumune at sword point and tried to escape back to their own territory. What happened next is a matter of debate; some sources state that Terumune, seeing that he couldn’t escape, ordered the pursuing Date forces (his own men) to open fire with their bows, killing the entire party, including Terumune.

Another source suggests that the Ashina, trapped by the Date pursuit, killed Terumune themselves, and were then cut down. A third source (written later) states that Masamune himself was responsible for Terumune’s death, and may have orchestrated the whole thing to get rid of his father. Though the exact circumstances will never be known, Terumune’s death also signalled the end of serious attempts to end the local conflicts through negotiation.

Shortly after his father’s somewhat controversial death, Masamune continued the war. In January 1586, he laid siege to Nihonmatsu Castle (in the city of the same name, in modern Fukushima). At this time, an army led by the Satake Clan, from Hitachi province (to the south), arrived to relieve the castle. The Date were defeated at the Battle of Hitotori Bridge, and Masamune himself was badly wounded before a rearguard action allowed him to escape.

The restored Nihonmastu Castle.
_{^{baku13 – 投稿者自身による著作物, CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=11354374による}}

The defeat was evidently not serious, because only a few months later, after the Satake had withdrawn, Masamune tried again, once again besieging Nihonmatsu Castle, forcing its surrender in July. Not long after this, he negotiated a peace with the Satake with the intention of focusing his efforts on finishing off the Ashina. This peace was short-lived, even by the standards of the day, as a succession crisis within the Ashina Clan drew the attention of the Satake, who supported a rival candidate to Masamune’s preferred choice.

Masamune interpreted this as the Satake intending to bring the Ashina under their control, which would have put the Date in an extremely vulnerable situation. In response, he declared his intention to wage a full-scale war against both the Ashina and Satake. In 1587, Toyotomi Hideyoshi, by now acting as regent, issued an order that all private wars should halt, an order that Masamune, for now at least, ignored.

Masamune initially had reason to regret his continued belligerence. In 1588, his old enemies, the Mogami Clan, took advantage of Masamune being distracted elsewhere and invaded Date territory at the same time as the Ashina Clan attacked in the south. After defeats at the Battle of Osaki and then at Koriyama, Masamune was obliged to seek peace with both clans, stabilising the situation in the short term.

In 1589, the peace with the Ashina Clan broke down once again, with Masamune invading the Aizu region (in the west of modern Fukushima). Masamune won a decisive victory at the Battle of Suriagehara in July 1589, causing the Ashina to flee their home castle at Kurokawa (modern Aizuwakamatsu) and seek help from the Satake. The Satake were obeying Hideyoshi’s peace order, however, and no help was forthcoming. Shortly after this, Masamune moved his base to Kurokawa Castle, and when a second order from Hideyoshi arrived, threatening direct intervention, Masamune took the opportunity to make peace.

Fukushima Prefecture, where Aizu is located.

A year later, Hideyoshi ordered the Date to join him in his attack on the Hojo Clan at the siege of Odawara. This put Masamune in a difficult spot, since the rule of his father, Terumune, the Date and Hojo had been nominal allies, and when Hideyoshi’s order arrived, it wasn’t immediately clear which side Masamune would join. Masamune eventually marched in support of Hideyoshi, but the regent wouldn’t forget Date disobedience of his peace order.

Sources
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E6%94%BF%E5%AE%97
https://ja.wikipedia.org/wiki/%E8%B1%8A%E8%87%A3%E7%A7%80%E6%AC%A1
https://ja.wikipedia.org/wiki/%E6%91%BA%E4%B8%8A%E5%8E%9F%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E8%8B%A5%E6%9D%BE%E5%9F%8E
https://ja.wikipedia.org/wiki/%E4%BA%8C%E6%9C%AC%E6%9D%BE%E5%9F%8E
https://ja.wikipedia.org/wiki/%E4%BD%90%E7%AB%B9%E6%B0%8F
https://en.wikipedia.org/wiki/Hitachi_Province
https://en.wikipedia.org/wiki/Aizu
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E6%B0%8F
https://ja.wikipedia.org/wiki/%E4%BC%8A%E9%81%94%E8%BC%9D%E5%AE%97

December 19, 2025
The Shimazu, Part 2

By 1582, the Shimazu were once again masters of southern Kyushu and had recently defeated the rival Otomo Clan so comprehensively that they effectively ceased to be an obstacle to Shimazu dominance of the whole island. This ambition would be curbed by the intervention of Oda Nobunaga, who wanted to get the Otomo to join his attack on the Mori Clan.

The situation in 1582. The Shimazu are in blue, and the Otomo in purple. The Mori are in yellow, and Oda Nobunaga is the big red blob in the middle.
_{^{By Alvin Lee – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39198356}}

Nobunaga’s plans, along with his life, would be cut short in the Honnoji Incident in June 1582, and the Shimazu once again found themselves as the strongest clan on Kyushu. In the far north-west of the island, close to the modern city of Nagasaki, lay the base of the Ryuzoji Clan. For generations, the Ryuzoji had been a secondary clan in the region. However, under the leadership of Ryuzoji Takanobu, they had expanded their power to control the whole of Hizen Province (modern Nagasaki and Saga Prefectures), and although they had nominally been subordinates of the Otomo Clan, the aftermath of the Battle of Mimikawa in 1578 (which the Otomo lost) gave the Ryuzoji the opportunity to expand even further. (They are in the light-green on the map above).

It was inevitable that the Shimazu and Ryuzoji would clash, and in 1584, a member of the Arima Clan wrote to Shimazu Yoshihisa, requesting his aid against the Ryuzoji. This was a convenient excuse to do what he probably would have done anyway, and Yoshihisa dispatched an army under his brother Iehisa. What followed was a lightning campaign in which the Shimazu, despite being outnumbered more than three-to-one, engaged and defeated the Ryuzoji at the decisive Battle of Okitanawate in May 1584.

This proved to be yet another decisive victory for the Shimazu. Not only did they defeat the Ryuzoji army, Takanobu, but the lord of the clan was also killed, cutting the head off the proverbial snake. The Ryuzoji had expanded rapidly, and their control collapsed just as quickly. Clans who had been forced to submit quickly switched sides to the Shimazu, and any holdouts were destroyed in short order.

In 1586, Yoshihisa turned his attention to the remnants of the Otomo Clan, invading Bungo Province and crushing the final remnants of what had once been Kyushu’s pre-eminent clan. Yoshihisa might have had time to reflect on the fleeting nature of power in that era, but he wouldn’t have had long. No sooner did the Shimazu deal the final blow to the Otomo than the last holdouts of that clan appealed to the new power in Japan for help, Toyotomi Hideyoshi.

The situation in 1586, after Toyotomi Hideyoshi secured power, and the Shimazu came so close to unifying Kyushu.
_{^{By Alvin Lee – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39214208}}

The Shimazu were at the height of their power, and it is perhaps no surprise that, when Hideyoshi order them to cease their attacks on the Otomo, they refused. Yoshihisa went even further, when he suggested that the Shimazu, and old and storied clan, had no need to accept an ‘upstart’ like Hideyoshi as regent. Hideyoshi had been born a peasant, but he was the most powerful warlord in Japan by that point, and Yoshihisa would come to regret the disrespect.

When it became clear that Hideyoshi meant to invade Kyushu, the Shimazu doubled their efforts to crush the Otomo and secure the whole island. They rightly guessed that any Otomo holdouts would be used by Hideyoshi’s forces as a base for any campaign. Though they would ultimately be unable to fully subjugate the Otomo, the Shimazu’s confidence seemed to have been well placed when, in early 1587, Chosokabe forces, under Hideyoshi’s orders, invaded Bungo province and were heavily defeated at the Battle of Hetsugigawa.

Shimazu celebrations would be short-lived, however. Hideyoshi, reportedly enraged by the ease with which the Shimazu had apparently defeated the initial invasion, mustered a force of between 250,000 and 300,000 men (reports vary), possibly the largest army seen in Japan up to that time. Throughout the spring and summer of 1586, this huge force steamrolled the Shimazu. There were instances of brave resistance, but the writing was on the wall, and in June, the Shimazu sued for peace.

Taiheiji Temple in modern Kagoshima, where Shimazu Yoshihisa met with Toyotomi Hideyoshi, and a peace was agreed.
_{^{Sakoppi – 自ら撮影, CC 表示 3.0, https://commons.wikimedia.org/w/index.php?curid=12570199による}}

The terms were harsh, but ultimately secured the survival of the clan. Hideyoshi demanded that the Shimazu give up control of almost the whole of Kyushu, essentially wiping out centuries of conquest and expansion. In return, the Shimazu were confirmed as lords of Satsuma province, and later, after further negotiations, Osumi as well.

The Shimazu would prove to be somewhat unreliable vassals. When Hideyoshi invaded Korea in 1592, he ordered all feudal lords to commit troops. The Shimazu were apparently slow to comply with this order, leading Hideyoshi to suspect they were disloyal (which they probably were, having been only recently conquered)

The Shimazu would eventually obey and dispatch troops to Korea, but it appears that Yoshihisa had been replaced as head of the clan in the eyes of Hideyoshi, as formal letters recognising Shimazu control of their provinces were written in the name of Shimazu Iehisa, Yoshihisa’s younger brother, though it appears that Yoshihisa retained the actual power.

Shimazu Iehisa (sometimes called Yoshihiro), the nominal head of the Shimazu after Hideyoshi’s invasion of Kyushu.

Hideyoshi’s death and the end of the war in Korea refocused the realm’s attention back home, as Hideyoshi’s son and heir was just a child. The Shimazu would not be members of the Council of Regents, but when the final rupture occurred in 1600, and war became inevitable, Shimazu Iehisa (nominal head of the clan) was in Kyoto and swore loyalty to the Western (or pro-Toyotomi) army.

This move was apparently not supported by his older brother and the wider Shimazu clan, as when Iehisa requested reinforcements, he received none. This might have been a deliberate ploy by the Shimazu to play both sides, but it’s also possible that an outbreak of fighting in Kyushu caused the Shimazu to focus their efforts closer to home.

The fighting was relatively small-scale and was nominally between supporters of the Toyotomi and Tokugawa Ieyasu (who had just won the decisive Battle of Sekigahara). In reality, this was probably an example of a breakdown in central authority being taken advantage of by local warlords. Unlike in previous eras, however, central control was swiftly reestablished. After his victory at Sekigahara, Ieyasu turned his attention to subduing the rest of the realm, Kyushu included.

Tokugawa Ieyasu.

A planned campaign against the Shimazu was cancelled in favour of negotiations that lasted nearly two years. Ieyasu suggested that Yoshihisa travel to Kyoto in person, but Yoshihisa always had an excuse not to go; he was ill, the roads were bad, the weather was awful, he hadn’t got enough money, etc. Finally, in 1602, Ieyasu, who apparently had no real appetite for a campaign in Kyushu, confirmed Shimazu control of Satsuma and Osumi Provinces after Yoshihisa’s brother, Iehisa, went to Kyoto in his place (some sources say Yoshihisa actually opposed this idea, only approving it after the fact, when his brother had already departed)

The Shimazu would be largely left in peace in the decades that followed. In 1609, Iehisa, but now more or less dejure lord of the Shimazu, received permission from the Tokugawa to invade the Ryukyu Kingdom (modern Okinawa). This meant that the Shimazu became the only clan to control a foreign kingdom, and meant that, when Japan entered its period of isolation (Sakoku), the Shimazu were one of the few who still had access to the outside world.

These contacts would grant the Shimazu an unusual level of economic strength in the Edo period, and this, combined with some strategic marriages into the Tokugawa, meant that the clan, despite (or perhaps because of) its distance from Edo (modern Tokyo), became one of the richest and most powerful of the era.

A Ryukyu tributary mission to China. The relationship between Ryukyu and China allowed the Shimazu to maintain indirect trade links with mainland Asia.

This proved to be important in the 19th century, when the irresistible tide of modernisation swept Japan after the first American, but later, other powers sought to take advantage of Japan’s weak position for their own ends. It would be the Shimazu (better known as Satsuma Domain by then) under their leader Nariakira, who were amongst the first to grasp the potential for Western-style industrialisation and warfare.

Satsuma Domain would be at the vanguard of the Meiji Restoration, with its alliance with the Mori clan of the Choshu Domain proving to be the decisive factor in the brief, but bloody Boshin War that saw the Tokugawa overthrown and Imperial rule reestablished.

The Shimazu themselves would endure the tumultuous years of the late 19th and 20th centuries, and the family survives today, with the 33rd head of the clan, Shimazu Tadahiro, serving as CEO of the Shimazu Corporation, which works to promote not only the cultural legacy of the Shimazu family, but also tourism and business development in and around Kagoshima, the traditional heart of the Satsuma Domain.

Sources
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E7%BE%A9%E4%B9%85
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E7%BE%A9%E5%BC%98
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E6%B0%8F#
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E5%BF%A0%E8%A3%95
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E8%88%88%E6%A5%AD
https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%B4%A5%E6%96%89%E5%BD%AC
https://ja.wikipedia.org/wiki/%E6%A0%B9%E7%99%BD%E5%9D%82%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E4%B9%9D%E5%B7%9E%E5%B9%B3%E5%AE%9A
https://ja.wikipedia.org/wiki/%E6%88%B8%E6%AC%A1%E5%B7%9D%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E6%B2%96%E7%94%B0%E7%95%B7%E3%81%AE%E6%88%A6%E3%81%84
https://ja.wikipedia.org/wiki/%E9%BE%8D%E9%80%A0%E5%AF%BA%E9%9A%86%E4%BF%A1
https://en.wikipedia.org/wiki/List_of_daimy%C5%8Ds_from_the_Sengoku_period

December 11, 2025
Memento Mori, Part 3

Last time, we looked at how the relationship between Mori Terumoto and Oda Nobunaga broke down, leaving both sides on the verge of conflict. After Terumoto declared for the Shogun, Ashikaga Yoshiaki (the last Ashikaga Shogun) declared that Terumoto would serve as ‘Vice Shogun’, a slightly ambiguous position which was rendered largely moot in practice, as the Shogun relied almost entirely on Mori’s strength of arms, reducing him to little more than a figurehead.

Ashikaga Yoshiaki, the last of the Ashikaga Shoguns, and little more than a figurehead.

The first action of this new ‘Shogunate’ (read: Mori) army was supporting the besieged warrior monks of Ishiyama Hongan-ji. You may recall in the post about the Ikko-Ikki, we mentioned Nobunaga’s campaigns against Hongan-ji, which ultimately lasted more than a decade, and left the temple a charred ruin.

The Mori, possessing one of the most powerful navies amongst the Sengoku Daimyo, dispatched a fleet which made short work of the Oda forces in Osaka Bay, opening the way for supplies to be delivered to Hongan-ji. This victory prolonged the siege and gave the Mori unchallenged control of the Seto Inland Sea in the short term.

Later that year, Nobunaga sought to restore the Amago Clan (long-time enemies of the Mori) to a position of strength, putting up Amago Katsuhisa, the last Amago ‘lord’ at Kozuki Castle, in Harima Province, hoping to attract Amago loyalists and any other opponents of the Mori, and make life difficult for Terumoto.

A later image of Amago Katsuhisa, the last ‘lord’ of the Amago Clan.

In response, Terumoto himself led an army to lay siege to Kozuki, and when a relief force, led by Hashiba (later Toyotomi) Hideyoshi, arrived, Terumoto handily defeated it, driving the Oda out of Harima Province, taking Kozuki Castle, and obliging the remaining Amago partisans to commit seppuku, which isn’t bad for a day’s work.

Not long after this success, Terumoto would expand his influence in Harima still further, convincing several lords to defect to the Mori, and bottling up Nobunaga’s remaining loyalists in the province. After this series of successes, Terumoto had Nobunaga on the back foot, and in response, he pressured the Imperial Court to issue an order that Hongan-ji make peace with Nobunaga. The monks of Hongan-ji expressed a desire to make peace, but not without Terumoto, to whom they owed a debt of gratitude. In response, Nobunaga agreed and began negotiations with Hongan-ji and the Mori.

The strategic situation shifted considerably in the early winter, however, as a Mori fleet dispatched to deliver further supplies to Hongan-ji was defeated by new ironclad ships of the Oda Navy. The exact nature of these vessels isn’t clear; the word ‘ironclad’ is a direct translation from Japanese, implying the vessels were at least partially armoured, though the exact style and extent of armour isn’t clearly recorded.

An example of the type of warship used by the Mori Navy.

Shortly after this victory, which drove the Mori beyond Awaji Island and opened Osaka Bay to the Oda, Nobunaga swiftly called off negotiations and made plans to continue the war. Despite the defeat, the Mori were still in a very strong position, however, and at this point, Terumoto made plans to advance on Kyoto and take the fight to Nobunaga directly.

Plans were laid, including negotiation with Takeda Katsuyori for a simultaneous attack on Nobunaga’s ally, Tokugawa Ieyasu, and Terumoto set the date of the start of the campaign for early 1579. However, early 1579 came and went, and the Mori did not march. A series of rebellions broke out around the same time, supposedly instigated by both Nobunaga and the Otomo Clan (rivals to the Mori on Kyushu), and Terumoto had his hands full.

The situation went from bad to worse for the Mori throughout 1579, as several border clans, angered at what they saw as a ‘betrayal’ when Terumoto failed to march on Kyoto, defected to the Oda side, disrupting communications with troops on the front line, and opening several gaps in Mori defences. The Mori failure to march also resulted in no further attempts to relieve Hongan-ji, and it was forced to surrender in early 1580.

Not long after that, Nobunaga was able to focus significant forces on the Mori, and an army led by Hashiba Hideyoshi took advantage of the Mori’s weak position and launched a series of successful attacks against them, capturing castle after castle. A counter-attack in February 1582 led to a brief reprieve, but news from elsewhere was bad.

A later artistic depiction of Toyotomi Hideyoshi (then still called Hashiba) around 1582.

The Takeda, with whom the Mori had allied against Nobunaga, were decisively defeated in early Spring, and with their removal, Nobunaga turned his entire attention to the Mori. The situation was dire. A little more than five years earlier, the Mori had been a match for Nobunaga; indeed, had Terumoto marched on Kyoto, he would have had a good chance of success.

Now, however, Nobunaga was stronger than ever, and internal rebellion, defections, and military defeats meant that the Mori were far weaker in comparison. Had Nobunaga advanced, he almost certainly would have won.

As is so often the case, however, fate intervened. Nobunaga was betrayed by one of his generals in June 1582 and killed. His supporters immediately turned on each other, with Hashiba Hideyoshi, the man who had been leading the charge against the Mori, wishing to establish himself as Nobunaga’s successor, and so he concluded a swift peace with the Mori. For his part, Terumoto was glad to accept, even though it meant sacrificing three provinces. When news of Nobunaga’s death broke, Ashikaga Yoshiaki, still with the Mori, ordered Terumoto to march on Kyoto and take advantage of the situation.

A 19th century depiction of Oda Nobunaga’s final moments.

Terumoto refused, still forced to deal with internal rebellion, and although there would be plenty of opportunities to involve himself in the chaotic fighting that followed Nobunaga’s betrayal, the Mori would not move, instead adopting a ‘wait and see’ approach, which, in hindsight was wise, as although history would record Hideyoshi as the ultimate victor, in the summer of 1582, that was far from certain.

One thing that Terumoto did agree to, however, was refusing to accept the ceding of three provinces to Hideyoshi as part of their peace deal. No doubt the Mori felt that Hideyoshi had misled them (Terumoto hadn’t known about Nobunaga’s death before the agreement), and with Nobunaga’s successors tearing each other apart, the Mori were in a good position to keep hold of their territory.

Negotiations dragged on, even after Hideyoshi was able to win a decisive victory at the Battle of Shizugatake in April 1583, and he began to lose patience, threatening a resumption of war if the Mori didn’t concede. It would not be until early 1585 that a peace was actually agreed, and it was achieved largely without fresh fighting. The Mori would be allowed to keep seven provinces, representing much of the territory that had been taken by Terumoto’s grandfather, Motonari. In exchange, the Mori agreed to support Hideyoshi’s campaigns to unite the realm, especially in Shikoku and Kyushu, which the Mori assisted in invading in May 1585 and August 1586, respectively.

The strategic situation in 1584, just after Hideyoshi secured power. The Mori are represented in yellow, and Hideyoshi in red.
_{^{By Alvin Lee – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39198357}}

Finally, in the summer of 1586, Terumoto formally became a vassal of Hideyoshi (by now known as Toyotomi), ending decades of conflict and proving to be a significant step in bringing the Sengoku Jidai to an end more generally. A testament to the new trust placed in the Mori came in 1590, when Hideyoshi attacked the Hojo Clan, masters of the Kanto. Though the Mori did not join the campaign, Mori troops were entrusted with guarding the capital while Hideyoshi was away.

Around this time, Terumoto completed his new base at Hiroshima Castle and would take part in Hideyoshi’s ill-fated invasion of Korea in 1592. We will go into more detail about the events that followed later, but after Hideyoshi’s death in 1598, Terumoto was named as one of five regents for his infant son, Hideyori.

The five regents were meant to stabilise the realm until Hideyori came of age, but it didn’t work; Tokugawa Ieyasu was swiftly opposed by the other four as it was believed (rightly as it turned out) that he wished to overthrow the current government and make himself Shogun. The tension would eventually lead to a new outbreak of violence, and a brief campaign culminated in the decisive Battle of Sekigahara in 1600.

Teruhito and the Mori Clan were officially in opposition to the victorious Ieyasu, but had dispatched only a small force to Sekigahara, keeping their main strength at Osaka Castle to guard the heir. This was the strongest castle in the realm, and Terumoto had tens of thousands of fresh troops with which to hold it. Ieyasu, apparently aware of this, dispatched a letter to Terumoto, expressing his desire for positive relations between the two, and hoping that the Mori would depart Osaka without further violence.

The walls of Osaka Castle as they appeared in 1865.

Terumoto agreed when Ieyasu confirmed that the Mori would lose no territory in the aftermath. However, Ieyasu would almost immediately go back on his word once Terumoto was safely away from Osaka. The Mori were reduced to just two provinces in the far west, Suo and Nagato, and almost all the territory taken by Motonari and Terumoto was lost.

Terumoto himself would officially retire as head of the clan not long after Sekigahara and became a monk, though in reality, he would retain most of the actual authority within the clan. One challenge that came about almost immediately was the loss of income that came with the loss of territory. Before Sekigahara, the Mori had had an income of more than 1 million koku (a Koku being approximately how much rice one man needed for a year). After Sekigahara and the loss of five of their provinces, this income was down to less than 300,000.

This loss in income led to a loss in strength, as many of the clan’s retainers found their stipends reduced or lost entirely, leading them to seek employment elsewhere (just in case you thought Samurai were all about unquestioned loyalty.) Terumoto rather astutely recognised that this reduction might actually benefit the clan long term, as disloyal vassals would leave quickly, and even those who remained could be chosen based on ability, leading to a reduction in the clan’s overall strength, but perhaps improving skill and efficiency, at least in theory.

A 19th century photograph of Hagi Castle, where the Mori Clan were based after their forced relocation.

This would prove a wise move, as a land survey in 1610 showed that the Mori’s financial situation was better than originally assumed, and the reduction in vassals and retainers had led to a leaner, more efficient administration.

Peace in the realm would last a while under Tokugawa Ieyasu’s rule, but it was a fragile thing. In 1614, the now adult Toyotomi Hideyori (Hideyoshi’s heir) brought about a crisis when a new prayer bell was inscribed with language that was interpreted as calling for the overthrow of the Tokugawa. Hideyori holed up in Osaka Castle and called on all ‘loyal vassals’ to come to his aid. Most, including Terumoto, ignored him, and when Ieyasu marched on Osaka, he requested the Mori dispatch their navy in support, which they duly did.

Terumoto also led an army to Osaka, though the Mori would ultimately play a relatively small role in the so-called Winter Siege of Osaka. The following year, during what is called the Summer Siege, Ieyasu attacked Osaka again, this time successfully, capturing and executing Hideyori, and bringing his line to an end.

Tokugawa Ieyasu, the man who would ultimately bring the Sengoku Jidai to an end.

The Mori were again asked to dispatch an army, but delays in orders and the length of the march meant they arrived only after Osaka had fallen. There was some concern that this delay might be interpreted as treachery by Ieyasu; however, even the savvy political operator, Ieyasu, chose to lay the blame on slow communication instead, sparing the blushes of the Mori.

Terumoto, his health failing and age catching up with him, handed full control of the clan over to his heir, Hidenari, in 1621, and although a formal system of ‘dual leadership’ would continue, it was becoming increasingly clear that Terumoto’s time was running out.

He would continue to play a role in the affairs of the Mori until his death in 1625, and his clan’s distant position from the new capital in Edo afforded them a certain degree of autonomy, at least with regard to internal affairs, in the years that followed.

That would prove important in the 19th century, as the arrival of American ships in Edo Bay forced Japan to end its period of isolation. It would be the Mori Clan, based in what by then was called the Choshu Domain, who would lead the charge against the Tokugawa Shogunate, overthrowing it, and re-establishing Imperial Rule in the so-called Meiji Restoration, but we are getting way ahead of ourselves.

Mori Motonari, the last lord of Choshu Domain.

Mori Terumoto is one of the giants of the Sengoku Era. Building on the successes of his grandfather, Motonari, he led the Mori to a position in which they may well have been able to take power for themselves, had things gone a little differently. Ultimately, despite never gaining ultimate power for themselves, Terumoto and his successors would prove to be one of the success stories of this period, surviving the turmoil and even thriving in the new Japan of the 19th Century.

Sources
https://ja.wikipedia.org/wiki/%E6%AF%9B%E5%88%A9%E8%BC%9D%E5%85%83
https://ja.wikipedia.org/wiki/%E5%BA%83%E5%B3%B6%E5%9F%8E
https://ja.wikipedia.org/wiki/%E4%BA%AC%E8%8A%B8%E5%92%8C%E7%9D%A6
https://ja.wikipedia.org/wiki/%E9%B3%A5%E5%8F%96%E5%9F%8E
https://ja.wikipedia.org/wiki/%E9%89%84%E7%94%B2%E8%88%B9
https://ja.wikipedia.org/wiki/%E5%89%AF%E5%B0%86%E8%BB%8D
https://en.wikipedia.org/wiki/M%C5%8Dri_Terumoto
https://ja.wikipedia.org/wiki/%E5%B0%BC%E5%AD%90%E5%8B%9D%E4%B9%85
https://en.wikipedia.org/wiki/Toyotomi_Hideyoshi
https://en.wikipedia.org/wiki/Tokugawa_Ieyasu

November 20, 2025
The Dragon of Echigo

Much like Takeda Shingen, Kenshin’s real name wasn’t Kenshin, but Kagetora, with Kenshin being a religious name given in later life. However, as this is the name he is best known by, we will be referring to him as it throughout.

Uesugi Kenshin, the Dragon of Echigo and the topic of this post.

If you live your life in such a way that you earn the nickname ‘Dragon of something’ and have followers who think of you as an avatar of the God of War, then I’d say you’ve done pretty well for yourself. By this standard, our subject for today, Uesugi Kenshin, is a historical figure worthy of a closer look.

Confusingly enough, Uesugi Kenshin wasn’t actually a member of the Uesugi family to begin with. He was a scion of the Nagao family, a strong clan who were vassals of the Yamanouchi branch of the Uesugi Clan, based in Echigo Province, in what is now Niigata Prefecture.

Echigo Province.
_{^{By Ash_Crow – Own work, based on Image:Provinces of Japan.svg, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1655309}}

Born in 1530, it is quite likely that Kenshin’s mother was a concubine, and what’s more, the boy himself was the second son. He was never intended to inherit control of the Nagao Clan, and he entered the temple at Risenji at age 11, apparently set on a life as a monk.

He doesn’t seem to have stayed at Risenji for long, however, as when his father died in 1542, just a year later, he was at the funeral with armour and sword at his side, and shortly after that, he was at Tochio Castle when a rebellion against Kenshin’s brother (the new Lord Nagao) broke out. Despite being just 14, Kenshin is supposed to have led the defence of the castle and won his first victory.

At the time, though the Uesugi were nominally the lords of the region, the Nagao served as deputy (and de facto) governors in their place. After the death of Kenshin’s father, it was his elder brother, Harukage, who inherited this position. The brothers don’t seem to have gotten along very well, however, and in the late 1540s, a movement emerged within the Nagao clan that sought to replace Harukage with Kenshin as head of the clan.

The remains of Tochio Castle, site of Kenshin’s first victory.
^{_{nubobo – 栃尾城本丸跡, CC 表示 2.0, https://commons.wikimedia.org/w/index.php?curid=59682349による}}

Exactly why the clan was so against Harukage isn’t clear, but their efforts were ultimately successful. In 1548, under mediation from Uesugi Sadazane (their nominal overlord), Harukage agreed to adopt Kenshin, then retire as head of the clan, clearing the way for Kenshin to become head of the Nagao Clan aged just 18 or 19 (depending on the source).

In 1550, Sadazane died without an heir, leaving Echigo Province without a lord. At this point, Shogun Ashikaga Yoshiteru instructed Kenshin to take the position of shugo of the province, effectively making him the new lord. Shogunate recognition was not quite the prestigious thing it had once been, however, and not long after this, supporters of Kenshin’s brother rose up in rebellion against him.

Kenshin quickly bottled up the rebels at Sakado Castle, when the castle fell, the leader of the rebels was spared because he was Kenshin’s brother-in-law, and following this, Kenshin, still aged just 22 had established effectively control over the whole of Echigo Province.

Looking back for a moment, five years earlier, the Uesugi Clan (or more accurately, the Ogigayatsu branch of the clan) had been defeated at the Battle of Kawagoe by the new rising star of the Kanto, the Hojo Clan. The Ogigayatsu-Uesugi were wiped out after this battle, leaving only the Yamanouchi Branch of the clan. In 1552, Uesugi Norimasa, who was, on paper, the Kanto Kanrei (Shogun’s deputy) was finally driven out of the Kanto entirely and sought refuge with Kenshin.

A later depiction of Kawagoe Castle.

Unsurprisingly, harbouring their enemies didn’t do much for the relationship between Kenshin and the Hojo, and Kenshin would send an army to oppose the Hojo’s invasion of Kozuke Province (modern Gunma Prefecture), capturing Numata Castle, and forcing the Hojo to retreat.

A year later, Kenshin would face a new enemy, as Takeda Shingen’s long-running invasion of Shinano eventually obliged some of the clans there to flee and seek refuge with Kenshin in Echigo. Much like the Hojo, the Takeda didn’t take kindly to someone giving refuge to their enemies, and one of Japanese history’s most famous rivalries was born.

In August 1553, an army led by Kenshin himself advanced against the Takeda in Shinan, defeating Shingen himself at the Battle of Fuse on August 30th, then again at Yuwata on September 1st. After this, Shingen adopted a strategy of avoiding direct battle with Kenshin, and the conflict settled into a stalemate that was later called the First Battle of Kawanakajima.

A modern view of Kawanakajima.
_{^{日本語版ウィキペディアのBlogliderさん – 原版の投稿者自身による著作物 (Original text: Photo by Bloglider.), CC 表示-継承 3.0, https://commons.wikimedia.org/w/index.php?curid=12400636による}}

In 1554-55, Kenshin was obliged to face a rebellion launched by treacherous vassals in league with Shingen. Putting down the rebellion quickly, Kenshin again marched into Shinano in April 1555 to face the advancing Takeda forces, again led by Shingen.

At the Second Battle of Kawanakajima, the two sides faced each other in another stalemate, which dragged on for five months, before mediation from the Imagawa Clan led to both sides withdrawing after little actual fighting.

In the following year, Kenshin apparently announced he would retire and become a monk, however, another outbreak of Takeda-backed rebellion forced him to change his plans, and after a period of peace, in 1557, Shingen again advanced against Kenshin’s allies in Shinano, forcing him to intervene and leading to the Third Battle of Kawanakajima, which, much like the previous two, swiftly settled into stalemate.

A year later, Kenshin dispatched an army in an ultimately unsuccessful invasion of Kozuke Province and then in 1559 he was ‘invited’ for a meeting with the Shogun, Ashikaga Yoshiteru. Some sources say that Kenshin was granted the title of Kanto Kanrei at this time, the position traditionally held by the Uesugi Clan. He also apparently donated funds towards the maintenance and repair of the Imperial Palace.

Swords supposedly gifted to Kenshin by the Emperor, photographed in 1928.

It seems that Kenshin enjoyed good relations with the Shogunate, but the already well-established decline of the Shogun’s power is highlighted again when he asked Kenshin, Shingen, and the Hojo to make peace in order to combine their forces against the Shogun’s enemies. All three parties refused.

In March 1560, the Imagawa Clan’s devastating defeat at Okehazama opened the way for Kenshin to intervene directly in the Kanto again, as the Imagawa had been allied to his enemies, the Hojo, and their defeat left the Hojo vulnerable. Later that year, Kenshin launched another large-scale invasion of Kozuke Province, driving the Hojo back and capturing several important castles before celebrating New Year at Maebashi Castle, the gateway to the Kanto Plain.

In March 1561, Kenshin was formally adopted by the Yamanouchi-Uesugi Clan (the only remaining branch) and changed his surname to match. Though he would be known as Uesugi Kagetora from this point, we will continue to call him Kenshin to keep things simple.

In August of that year, Kenshin led another large army into Shinano, and engaged the Takeda at the Fourth Battle of Kawanakajima. Unlike the previous three, this battle was not an extended stalemate, but a bloody one. Both sides suffered heavy casualties, with sources ranging from around 20% losses, to as high as 60 or 70%, and when the battle was over, the Takeda held the field, but made no attempt to intervene as the Uesugi withdrew, leading some to suggest the battle was a bloody draw.

A legendary depiction of the Fourth Battle of Kawanakajima, depicting the (possibly apocryphal) moment that Uesugi Kenshin and Takeda Shingen met on the field.

The Takeda and Hojo clans, recognising the Uesugi as their common enemy, renewed their combined efforts and launched a joint counter-attack in Musashi Province in late 1561. At first, Uesugi forces were successful against the alliance, even getting as far as besieging Odawara Castle, the Hojo’s main stronghold, before being forced to withdraw after allied counter-attacks in other parts of the Kanto.

The strategic situation in the Kanto would ebb and flow over the following years, as Uesugi, Takeda, and Hojo armies advanced and retreated, and the local lords would switch sides depending on whoever appeared to be in the ascendancy.

All three factions would be occupied with fighting each other, but also engaged in other battles and proxy wars with allies and supporters of each other’s enemies. For Kenshin, this meant being obliged to dispatch forces into neighbouring Etchu Province in 1568, to deal with Ikko Ikki forces nominally allied with Shingen.

Etchu Province.

Seeking to take advantage of this distraction, Takeda forces attacked in Shinano and were ultimately defeated, but a rebellion in Echigo (Kenshin’s home province) meant he was unable to take advantage of this victory in the short term.

Later that year, the strategic situation would shift in Kenshin’s favour, however, as the long-term decline in Takeda-Imagawa relations finally led to open conflict between two of his main rivals. The Imagawa would request aid from both the Uesugi and the Hojo, and while Kenshin would refuse, the Hojo dispatched forces to oppose the Takeda, bringing an end to the alliance that had done so much to oppose Kenshin.

However, years of expensive (and bloody) campaigns in the Kanto had left the Uesugi exhausted, and in 1569, Kenshin reluctantly agreed to a peace deal with the Hojo, which saw the Uesugi withdraw from Musashi Province (modern day Tokyo and Saitama) and the Hojo withdrew from Kozuke.

With his borders with the Hojo (relatively) secure, Kenshin was able to focus on campaigning against the Takeda again. In 1570 and 1571, he would engage the Takeda and their allies in Etchu and Shinano Provinces, generally having the better of the fighting, but the situation would shift again in 1572 when the lord of the Hojo, Ujiyasu, passed away, and was replaced by Ujimasa, who made peace with the Takeda, turning on the Uesugi. At the same time, the Etchu Ikko Ikki launched a fresh attack, instigated by Takeda Shingen.

Hojo Ujimasa, who reversed his father’s diplomatic policy.

The Ikko Ikki would initially be successful against Kenshin, but by mid-1573, the momentum had shifted back in his favour, and several key fortresses within Etchu were taken. Also in that year, Kenshin’s long-time rival, Takeda Shingen, passed away, an event that apparently caused Kenshin to weep openly, but also significantly weakened the Takeda.

Over the following two years, Kenshin was forced to split his focus between his ongoing campaign in Etchu and the situation in the Kanto. By the end of 1574, the Hojo had effectively ended any Uesugi presence in the region, and although Kenshin would launch counterattacks, the writing was on the wall for Uesugi power in the Kanto.

In 1576, Kenshin would receive a request for aid from the Shogun, seeking support against Oda Nobunaga, who now dominated central Japan and had forced the Shogun into exile. In order to get to Kyoto, Kenshin was obliged to focus all his resources on securing Etchu and Noto Provinces. This campaign would drag on throughout 1576 and 1577, delayed by intervention from the Hojo and internal rebellion, but by November 1577, Kenshin had secured control of the provinces and was poised to strike at Kyoto itself.

Noto Province.
_{^{By Ash_Crow – Own work, based on Image:Provinces of Japan.svg, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1690738}}

Mustering a large army, Kenshin would march out to meet a force led by Nobunaga’s generals, Shibata Katsuie and Hashiba Hideyoshi (better remembered to history as Toyotomi Hideyoshi), who were not fond of each other. A dispute led to Hideyoshi withdrawing his forces early, and when the two sides clashed at the Battle of the Tedori River on November 3rd, Kenshin would emerge victorious.

The exact course of the battle, and even the size of the forces involved, is not clear from contemporary sources, but Kenshin would withdraw temporarily, issuing instructions for a renewed campaign to begin in the spring. The battle at the Tedori River had opened a strategic opportunity for Kenshin, and it has been speculated that he might have been able to complete his march on Kyoto.

Much like his rival, Shingen, however, Kenshin would never make the march. In early March, Kenshin would collapse (allegedly whilst in the toilet) and fall into a coma from which he would never wake up; he died on March 13th, aged 49.

The site of Kenshin’s grave at Risenji, where he studied as a boy.
_{^{By shikabane taro, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=54071606}}

Much like the Takeda after the death of Shingen, the Uesugi would be seriously weakened by Kenshin’s death. Though they had been a threat to Nobunaga, Kenshin’s death, and the ongoing effects of years of more or less constant conflict, rendered them powerless to stop the rise of Nobunaga, and after his death in 1582, the Uesugi would make their peace with his successors.

Decisions made at the end of the Sengoku Jidai would see the clan’s star fall even further, though that is a story for another time.

Sources
https://ja.wikipedia.org/wiki/%E4%B8%8A%E6%9D%89%E8%AC%99%E4%BF%A1
https://ja.wikipedia.org/wiki/%E6%89%8B%E5%8F%96%E5%B7%9D%E3%81%AE%E6%88%A6%E3%81%84
https://en.wikipedia.org/wiki/Battle_of_Tedorigawa
https://ja.wikipedia.org/wiki/%E5%B7%9D%E4%B8%AD%E5%B3%B6
https://ja.wikipedia.org/wiki/%E5%89%8D%E6%A9%8B%E5%9F%8E
https://ja.wikipedia.org/wiki/%E6%B2%BC%E7%94%B0%E5%9F%8E
https://en.wikipedia.org/wiki/Battles_of_Kawanakajima

November 6, 2025
Soun – Rise of the Hojo

The mon of the Hojo, and Later Hojo clans.

Late 15th-century Japan was a chaotic place, but as we all know by now, chaos also presents opportunity. As central authority declined, local clans would move to fill the void. Some of these clans would fall almost as quickly as they had risen, others would continue to survive in one form or another throughout the Sengoku Period, and a select few would go on to be truly great.

The focus of this post is one of them, the Hojo (hence the title). Right away, I want to be clear that this Hojo and the Hojo we looked at previously (the ones who were regents during the Mongol Invasions) were not related, despite the same name and mon. Sometimes, this second Hojo Clan is called the “Later” Hojo (Go-Hojo) in Japanese, but for our purposes, we’ll just call them the Hojo and hope you remember the distinction.

Adding to our confusion, the founder of the clan, Hojo Soun, wasn’t actually called that. He was a member of the Ise Clan, and it was his son, the second “Lord” Hojo, who adopted the name and mon. Again, while it is technically more accurate to refer to this founder as Ise Souzui, we’ll call him Hojo Soun, because a) that’s the name he’s best remembered by, and b) it’ll get confusing if we keep changing his name.

Hojo Soun, who wasn’t called Hojo Soun, during his lifetime.

Side Note: Name changes were common in Japanese culture, with someone’s birth name rarely being the name they are recorded by historically. When you factor in nicknames, titles, honorifics, etc, you have individuals who may have gone by any number of names. Up until now (and continuing after this), I have always called historical characters by their most commonly used name, just in case you were wondering.

The man who would become Hojo Soun is the subject of considerable mythologising. In the pre-modern period, it was widely assumed that he had been a poor samurai who had risen to a position of power by sheer force of will, pulling himself up by the proverbial bootstraps.

20th-century scholarship has shed more light on his origins, however. He was a member of the Ise Clan, as we mentioned previously, and was born either in Kyoto or Ibara, in modern Okayama Prefecture. His family were not at the highest ranks, but they were administrators for the Shogun, meaning that they were often close to the centre of power and were certainly not the impoverished provincial family of later myth and legend.

Modern Okayama Prefecture, a possible birthplace of Soun.
_{^{By Lincun – 国土交通省国土数値情報(行政区域), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3916728}}

Soun’s exact origins are still a little unclear (we’re not even 100% sure what year he was born, though 1456 is considered most likely), but his rise to power came during the chaotic violence of the Onin War. As we looked at previously, one of the ancillary conflicts was in the Kanto, where Ashikaga Shigeuji and the Uesugi Clan clashed violently. Officially, Shigeuji was a rebel against the Shogunate, and the Uesugi were loyal servants, although in reality, neither side paid much attention to the capital.

One of the other clans in the Kanto at this time was the Imagawa, who remained loyal to the interests of the Shogun. In 1476, the head of the Imagawa was killed in battle, and his heir was just a boy (Ujichika). Factions quickly formed within the clan seeking to assert rival claims to leadership.

With the clan fracturing and external rivals seeking to take advantage, Soun, who was the brother of Lady Kitagawa, Ujichika’s mother, is said to have arrived at the Imagawa home in Suruga Province (in modern Shizuoka) to negotiate a peaceful settlement at the request of his sister. An agreement was reached in which the cousin of the previous leader (Norimitsu) would stand in as acting leader until the young boy came of age, whilst the rival factions were convinced (or compelled) to withdraw.

It is debated exactly what role Soun played in this negotiation. It is noted that he was very young (perhaps 20 or 21) to be a negotiator, and his name doesn’t appear in any official government records. The withdrawal of rival forces is also suggested to have been a reaction to problems elsewhere (the Uesugi faced rebellion at home, for example) and not a result of Soun’s negotiating prowess. While peace was certainly achieved within the Imagawa Clan, it is entirely possible that Soun’s role in achieving it was minimal, or perhaps even a later fabrication.

The first ‘official’ records of Soun come from the period of 1481-87, when he is recorded as a subordinate to the Shogun, presumably taking some role in the administrative affairs of the government. It is also speculated that Soun’s later departure for Suruga Province was motivated by legal troubles surrounding unpaid debts. Again, the exact nature of this problem isn’t clear, but there was certainly a legal case involving Soun and one of his creditors dated to this period, although the outcome is apparently lost.

In 1487, the previous agreement that had led to peace within the Imagawa Clan broke down. Norimitsu, who had been chosen to stand as ‘regent’ during the minority of Imagawa Ujichika, refused to step down. Although Soun’s role in the initial negotiation is debated, he certainly returned to Suruga Province around this time to force a settlement, apparently with the approval (or possibly at the direct order) of the Shogun and at the request, once again, of his sister, Lady Kitagawa.

Norimitsu had once been able to call on the support of external clans, but the political situation in the Kanto had changed in the decade since the original settlement, and that support no longer existed. Soun based himself at Ishiwaki Castle (in modern Yaizu, Shizuoka) and gathered supporters of Ujichika to his banner.

A view of Mt Fuji from a spot near modern Yaizu.
_{^{alonfloc, CC 表示 3.0, https://commons.wikimedia.org/w/index.php?curid=52973978による}}

In late 1487, Soun led an attack on Norimitsu and his supporters, defeating them in a short, sharp campaign that ended with Norimitsu’s suicide and Ujichika’s confirmation as leader of the Imagawa Clan. Soun was rewarded for his actions, but the exact location of his new lands is disputed, with several possible locations including the aforementioned Ishiwaki Castle.

Though the exact location of his base isn’t known for sure, Soun certainly remained in Suruga Province in the immediate aftermath of his success, acting as a protector for the young Ujichika. It is also suggested that during this period he acquired or was rewarded with estates in Izu Province, though again, that isn’t recorded with certainty.

Soun’s actions following this are murky; he appears to have returned to the direct service of the Shogun in around 1491, though he seems to have remained physically in Suruga Province. In 1493, the Meio Coup changed Soun’s situation considerably, although again the exact circumstances are open to speculation.

Suruga Province, where Soun made a name for himself. Izu Province is the peninsula to the bottom right of Suruga, and Sagami is just above that.
_{^{By Ash_Crow – Own work, based on Image:Provinces of Japan.svg, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1691794}}

What is certain is that Soun would lead an attack into neighbouring Izu Province that would eventually see him take control of the entire province. Some sources suggest that Soun was acting on the orders of Hosokawa Masatomo, the instigator of the Meio Coup; others indicate that Soun was acting on his own initiative. The situation in the Kanto was already volatile, and the coup in Kyoto had only made things worse, giving Soun a chance to improve his fortunes.

Soun’s actual conquest of Izu is subject to considerable mythologising, with some stories telling us that he spied on the province in person, posing as a pilgrim to the area’s many hot springs, whilst others say that he was welcomed as a liberator and kept his army under tight control, preventing any pillaging. Soun is also supposed to have secured the province in under 30 days, launching a surprise attack on the residence of the previous lord of Izu, and either killing him or forcing him to commit suicide.

The reality seems to have been a protracted campaign, with Soun trying to capture the leader of the province in a rapid advance, but failing to do so, leading to a drawn-out war that would not be finally resolved until 1498, though the historical record does seem to suggest that Soun’s victory was more or less guaranteed after around 1495.

Despite his conquest of Izu, Soun remained a nominal vassal of the Imagawa Clan and took an active part in their campaigns in the Kanto. He would campaign on their behalf in Kai Province, and in Sagami (modern-day Yamanashi and Kanagawa Prefectures), famously capturing Odawara Castle in late 1495. The legends tell us that Soun captured the mighty fortress through trickery, convincing the lord to go hunting and then taking the castle while he was away. Modern scholars suggest that a large earthquake that year undermined the fortifications of Odawara and made holding it untenable.

The remains of the moat at Odawara. The castle that stands on the modern site is a 20th century reconstruction of the fortress as it appeared in 1590. The castle that Soun took in 1495 would have been an formidable, but considerably smaller structure.
_{^{By 柴錬アワー – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=81578474}}

In the short term, Soun would continue to support the Imagawa Clan, but as time went on, he began to take on an increasingly independent appearance, as his power grew, and the Imagawa found themselves distracted by events elsewhere. In 1507, the Eisho Disturbance (which led to the Hosokawa Rebellion we talked about previously) ended what little remained of Shogunate influence in the Kanto, and with the Imagawa distracted (or by some accounts, overstretched), Soun was able to extend his direct control of Sagami and Izu Provinces.

Soun would clash with the Miura Clan of Sagami, who were in turn supported by the Ogigayatsu branch of the Uesugi Clan. Soun would advance on Edo Castle (on the site of the modern Imperial Palace in Tokyo) in early 1510, but a counterattack by the Miura and Ogigayatsu would drive him back as far as his base at Odawara.

Soun would survive this crisis, and the destruction of the Miura Clan is said to have become the singular focus of his later life. Starting in the summer of 1512, Soun would make steady advances against the Miura, driving them out of Sagami Province, and defeating supporting attacks from the Ogigayatsu, until, by July 1516, the Miura had been bottled up in the eponymous Miura Peninsula (in modern Kanagawa Prefecture) before being destroyed with the capture of their final fortress at Misaki Castle.

Soun would engage in several further campaigns, even crossing into modern Chiba, but in 1518, he handed control of the clan over to his son, Ujitsuna, before passing away in August the following year.

Hojo Ujitsuna, who would adopt the name and symbol of the Hojo after his father’s death.

Though Soun himself would never take the name Hojo, his actions secured the dominance of his clan in the Kanto region for most of the 16th Century. Though they would never be completely unchallenged, the clan would eventually rise to become masters of the area around modern Tokyo, until they eventually fell foul of Toyotomi Hideyoshi’s campaigns to unite the realm, with their mighty fortress at Odawara being taken, and the clan destroyed in 1590.

In many ways, Soun is the archetype of what would become known as a “Sengoku Daimyo”, a kind of warlord who was not content with simply fighting with his neighbours, but worked to improve the lands he ruled. In 1506, Soun ordered a land survey in Sagami Province, the first of its kind in this new era, and he would introduce sweeping reforms to law and justice in his territories that would serve as inspiration for generations of Samurai that followed him, and in some cases, formed the basis for the legal system in place during the Edo Period, and even into more modern times.

Sources
https://ja.wikipedia.org/wiki/%E5%8C%97%E6%9D%A1%E6%97%A9%E9%9B%B2
https://ja.wikipedia.org/wiki/%E5%BE%8C%E5%8C%97%E6%9D%A1%E6%B0%8F
https://ja.wikipedia.org/wiki/%E4%B8%89%E6%B5%A6%E5%8D%8A%E5%B3%B6
https://ja.wikipedia.org/wiki/%E7%AB%8B%E6%B2%B3%E5%8E%9F%E3%81%AE%E6%88%A6%E3%81%84

October 28, 2025