They came to his house with soldiers.

Not in ones and twos, not as petitioners arriving with grievances and protocols — they came in force, coordinated, having assembled first at Kato Kiyomasa's mansion in Osaka Castle before marching together to the residence of Ishida Mitsunari. Seven senior military commanders of the Toyotomi government: Fukushima Masanori, Kato Kiyomasa, Kuroda Nagamasa, Hosokawa Tadaoki, Asano Yoshinaga, Kato Yoshiaki, Ikeda Terumasa. Combat veterans of the Korean campaigns of 1592 and 1598. Men who had crossed the straits, fought across the peninsula, and come home to discover that the official written record of what they had accomplished — the assessments that determined honor, rank, and reward under the Toyotomi system — had been written by a man who had stayed home.

Ishida Mitsunari (石田三成) was Toyotomi Hideyoshi's most trusted administrator. A logistics genius, a meticulous bureaucrat, the kind of man who could keep an army of 150,000 fed across an overseas campaign and account for every bale of rice. He was also, by most accounts, spectacularly bad at being liked. The generals believed — not without cause — that his battle assessments had minimized their achievements, costing them honors they had earned in blood. In a culture where the official written record of battlefield performance was the mechanism through which power, status, and domain flowed from ruler to warrior, controlling that record was not administrative — it was warfare by other means. And Mitsunari had wielded it against men who were better soldiers than he would ever be.

He had been warned in time. He fled to the mansion of Satake Yoshinobu before the generals arrived, then barricaded himself inside 伏見城 (Fushimi-jō), the seat of government authority, while the seven generals surrounded it with their troops.

In the spring of 1599, Tokugawa Ieyasu (徳川家康) stepped forward as mediator. He was nominally one of Hideyoshi's Five Regents — the senior administrators sworn to protect the Toyotomi heir, Hideyori — and the most powerful warlord in Japan since Hideyoshi's death the previous year. His intervention resolved the standoff. He refused to hand Mitsunari over to the generals. He also refused to protect him in place. The deal he brokered was precise: Mitsunari would resign his post as one of the Five Commissioners, retire to his hereditary domain at Sawayama Castle in Omi Province — present-day Hikone, Shiga Prefecture — and remove himself entirely from Osaka's political life. Ieyasu's own second son, Yuki Hideyasu, personally escorted Mitsunari out of the capital.

It looked magnanimous. It was a masterpiece of strategic elimination.

Consider what Ieyasu had accomplished. He had publicly demonstrated impartiality — refusing to side with either the generals or the commissioner, positioning himself as the adult in the room, the man who could resolve what no one else could. He had removed Mitsunari from power without creating a martyr. He had done the seven generals a partial favor without being in their debt. And he had left Mitsunari alive.

That last point is the key.

A dead Mitsunari in the spring of 1599 would have been a gift to Ieyasu in the short term and a catastrophe in the long term. The anti-Tokugawa sentiment among the western daimyo was real and widespread — the domain lords who distrusted Ieyasu's ambitions, who feared he intended to claim power for himself rather than protect young Hideyori, who saw in his consolidation of marriage alliances and his movement of troops a preparation for a coup. Kill Mitsunari, and all that resentment remains: leaderless, uncoordinated, dangerous in the dispersed way that smoldering political anger is always dangerous — impossible to target, impossible to destroy with a single decisive blow.

Leave Mitsunari alive, humiliated and vengeful in a castle in the provinces, and something different happens. Every dissatisfied daimyo in Japan now has a center of gravity. They know where to go. They know who to coordinate with. They know what the coalition will call itself. And Ieyasu knows all of that too — knows the enemy's shape, its leadership, its rallying point — and can prepare accordingly.

From his supposed 隠居 (inkyo) — retirement — at Sawayama Castle, Mitsunari got to work immediately. He coordinated with Uesugi Kagekatsu (上杉景勝), whose militarization of his domain in the east gave Ieyasu the pretext to march his army away from Osaka in the summer of 1600. While Ieyasu marched northeast toward Aizu, Mitsunari issued his declaration against him — the Naishi no Tsubone Document of August 1600, a thirteen-article indictment of Ieyasu's violations of the Toyotomi regency — and raised the western coalition.

The army he assembled numbered roughly 120,000 men. Ieyasu's eastern force was approximately 75,000. On paper, Mitsunari should have won.

He didn't. On October 21, 1600, at the Battle of 関ヶ原 (Sekigahara), a mountain pass in Mino Province, the western coalition collapsed within hours — not because it was out-fought but because it had been pre-betrayed. Several western lords had already privately agreed to switch sides. Kobayakawa Hideaki's (小早川秀秋) forces held a commanding ridge above the battlefield and at the critical moment charged downhill into the western flank. Other defections followed. The battle was over by midday.

There is a story about Mitsunari and his general Otani Yoshitsugu (大谷吉継), who suffered from leprosy. At a tea ceremony, according to the legend, a drop of pus fell from Yoshitsugu's sores into a shared tea cup. The other guests recoiled. Mitsunari, without comment, drank deeply from the cup, declaring he was too thirsty to wait. That act of friendship bound Yoshitsugu to Mitsunari absolutely. At Sekigahara, knowing the western coalition was likely to lose because of the pre-arranged betrayals, Yoshitsugu joined anyway. When Kobayakawa's troops charged, Yoshitsugu — who had held his position against the assault longer than any other western commander — killed himself on the field rather than be captured. The story may be legend. The loyalty was real.

Mitsunari fled but was captured three days later in the mountains. He was brought before Ieyasu, who reportedly offered him medical care before execution. On November 6, 1600, Mitsunari was publicly beheaded in Kyoto alongside Konishi Yukinaga (小西行長) and Ankokuji Ekei (安国寺恵瓊), his head displayed at the Sanjo Bridge (三条大橋, Sanjō Ōhashi). Offered persimmons — a fruit believed to cause illness — he declined them, saying a man with ambitions still to fulfill should not risk his health. It was the last hours of his life. He declined anyway.

In 1603, Tokugawa Ieyasu was appointed 将軍 (shōgun) by the emperor, founding the shogunate that would rule Japan for 265 years. The western daimyo who had backed Mitsunari — the 外様大名 (tozama daimyo), outside lords — were demoted to peripheral domains and never fully trusted by the Tokugawa. It was samurai from these very domains — Satsuma (薩摩), Choshu (長州), Tosa (土佐) — who eventually overthrew the Tokugawa in the 明治維新 (Meiji Ishin), the Meiji Restoration of 1868.

Mitsunari's humiliation in the spring of 1599 set in motion a grudge that took 269 years to fully resolve.