The masterless samurai in the Satsuma (薩摩, Satsuma) compound at Mita knew what they were there for. 西郷隆盛 (Saigo Takamori) had recruited them from across Japan — men without lords, without futures, with nothing left to surrender — and installed them in the Satsuma domain's Edo residence like a slow fuse. Their job was to be provocative enough that the 幕府 (bakufu) could not ignore them. Their personal safety was not part of the plan.

For weeks in late 1867 and early 1868, Satsuma-linked 浪人 (rōnin) spread chaos across Edo. They set fires. They attacked 米商人 (kome shōnin) — rice merchants — whose grain supplies the city depended on. They raided government offices. Most audaciously, they struck the outer outworks of 江戸城 (Edo-jō) itself — the seat of Tokugawa power, the physical symbol of 265 years of rule. Each provocation was designed to push the bakufu toward the edge. The shogunate's city-policing forces, drawn from the 庄内藩 (Shōnai domain), were furious. The political leadership was under pressure to respond. Everyone in the government knew the Satsuma compound was the source. Inaction was becoming impossible.

That was exactly how Saigo had drawn it.

On January 19, 1868 — the 25th day of the 12th month of 慶応 (Keiō) 3 by the Japanese calendar — the Shōnai forces attacked the Satsuma residence at Mita and burned it to the ground. The ronin inside fought and were killed or captured; survivors were later executed. The compound that had served as Saigo's forward base was reduced to embers.

The trap closed perfectly. Satsuma and its coalition partner 長州 (Chōshū) had spent months positioning their alliance as the legitimate face of imperial restoration — defenders of the Emperor against a shogunate that had outlived its mandate. The burning of Mita handed them a narrative weapon. 徳川慶喜 (Tokugawa Yoshinobu), the fifteenth and last shogun, had attacked a domain whose only crime was loyalty to the Emperor. That the domain had in fact been running an urban terror campaign was not the story the imperial coalition chose to tell.

Yoshinobu's own generals were demanding action. The humiliation of standing by while imperial-coalition forces gathered in Kyoto was politically untenable. On January 27, Yoshinobu's army marched toward the old capital. At 鳥羽伏見 (Toba-Fushimi), just south of Kyoto, they met the Satsuma-Chōshū forces — and were destroyed. The imperial army flew the chrysanthemum banner of the Emperor for the first time in open battle. Neutral 大名 (daimyo) across Japan who saw or heard of that banner began defecting to the imperial side almost immediately. The political mathematics of Japan changed in days.

Yoshinobu fled Osaka by ship on January 30. He arrived in Edo on February 3, abandoning his own troops mid-campaign. His generals never forgave him. He surrendered Edo Castle bloodlessly in April after negotiations between Saigo Takamori and bakufu naval commissioner 勝海舟 (Katsu Kaishū) — a decision that spared Tokyo a catastrophic urban battle, though Yoshinobu himself seemed more interested in preserving his own life than the city. He lived in quiet retirement until 1913, outliving the Meiji Emperor himself.

The man who had engineered all of this — the fires, the provocations, the calculated sacrifice of the Mita ronin — went on to become one of the most celebrated figures in Japanese history. 西郷隆盛 (Saigo Takamori) helped dismantle the samurai class he had used to win power. He helped build the Meiji government, the conscript army, the modern state. Then, in 1877, he led the last armed samurai rebellion against that same government and died in a final, doomed charge on a hillside in 薩摩 (Satsuma). The man who had won a revolution through cunning and manipulation is remembered today as the embodiment of samurai honor.

The Mita compound burned on January 19. Japan would never be the same country again.