Ōshio Heihachirō's Rebellion

On the 19th day of the 2nd month of Tenpō 8 (March 25, 1837), in Osaka (present-day Osaka City), Ōshio Heihachirō, a former yoriki of the Osaka Eastern Town Magistrate's Office, rose in revolt together with his disciples and the common people. Remembered as one of the largest urban rebellions of the Edo period, and as a clash between the contradictions of the feudal system and the conscience of a samurai, this incident also holds significance from the perspective of the Japanese sword and the samurai spirit.

Ōshio Heihachirō (1793–1837) served for many years as a yoriki of the Osaka Eastern Town Magistrate's Office (a samurai who assisted the magistrate, roughly equivalent to a middle manager). At the same time, he was renowned as a scholar of Yōmeigaku (the practical Confucianism of Wang Yangming), and he opened the private academy Senshindō, where he trained many disciples. The core doctrine of Yōmeigaku is chikō gōitsu, the idea that knowledge and action are one, and it values practical morality over mere scholarship. Ōshio sought to thoroughly embody this spirit of Yōmeigaku.

The Great Tenpō Famine (1833–1839) brought poor harvests across the country, and in rural areas many people died of starvation. In Osaka too, prices soared and the lives of the poor deteriorated severely. Even after he retired from the magistrate's office in 1830, Ōshio could not look away from this hardship, and he sold his book collection to fund relief for starving people. However, Atobe Yoshisuke, the Osaka Eastern Town Magistrate, ignored Osaka's plight. He shipped rice purchased from wealthy merchants to Edo for the ceremony marking the installation of the new shogun, Tokugawa Ieyoshi, while the merchants were further attempting to corner the rice market.

Ōshio proposed relief measures for the common people to the magistrate's office, but his proposal was rejected, and he concluded that the path of reform through legal means had been closed off. Following the principle of chikō gōitsu, he came to believe that acting itself was a moral duty. From around Tenpō 7 (1836), he advanced plans for an uprising, recruiting like-minded allies and disciples. He devised a plan to set fire to the houses of wealthy merchants, seize the rice and money they had hoarded, and distribute them to the poor.

Just before the uprising, an informant leaked the plot to the magistrate's office, so Ōshio moved up his plans and rose on the morning of the 19th day of the 2nd month of Tenpō 8 (March 25, 1837). Raising a banner reading "Kyūmin" ("Save the People"), the rebels fired cannons and used gunpowder, and fires broke out across central Osaka through arson. It is said that about one-fifth of the city's built-up area burned. However, the shogunal and magistrate's forces suppressed the revolt quickly, and it was put down in little more than half a day. Ōshio and his son Kakunosuke continued to flee, but on the 27th day of the 3rd month of that year, the townhouse where they were hiding was discovered. Cornered, Ōshio died by suicide using explosives. Kakunosuke also took his own life the same day.

In the aftermath, harsh punishments were imposed on the surviving participants and those involved. Many people were executed or exiled, through crucifixion, beheading, and banishment to remote islands. Furthermore, although Ōshio had already died, the bakufu carried out the unusual punishment of posthumous crucifixion (shigo haritsuke), in which his corpse was crucified. This shows how deeply the shogunate was shocked and threatened by this rebellion.

Why does the Ōshio Rebellion hold significance from the perspective of the Japanese sword and samurai culture? First, Ōshio himself was a samurai (a yoriki), a man of the status entitled to wear swords. In the Edo period, the essence of the samurai's role lay in loyalty to the lord and the shogunate and in maintaining order. Ōshio, however, placed the moral mission of "saving the people" above loyalty to the bakufu. This is an instance of the concept of gi (righteousness, moral duty) in bushidō being wielded as a critique of the system, and it symbolizes an ideological shift in which the sword can be a tool for the people, not merely a symbol of authority.

Second, as an incident that expressed the late-stage contradictions of the feudal system through armed force, the rebellion profoundly influenced the samurai activists of the late Edo period. Yoshida Shōin highly praised Ōshio's book Senshindō Sakki, and Saigō Takamori also owned this book, which had been banned. The chikō gōitsu of Yōmeigaku that Ōshio employed also shared ideological continuity with the late-Edo sonnō jōi (revere the emperor, expel the barbarians) movement. It is considered by some to have been one factor that formed the spiritual soil for the later Meiji Restoration.

Furthermore, this incident was distinctive in that it was an uprising by samurai in Osaka, a commercial city. Because it was led not in the countryside but in a city, and by former samurai rather than farmers, it symbolized the severity of the social contradictions of the Tenpō era. The shock of the Ōshio Rebellion spread nationwide, and in the same year, in Kashiwazaki in Echigo (present-day Kashiwazaki City, Niigata Prefecture), the kokugakusha (National Learning scholar) Ikuta Yorozu attacked the Kashiwazaki jin'ya of the Kuwana Domain in response to the Ōshio Rebellion. Similar chain reactions appeared in various places.

The Ōshio Heihachirō Rebellion will forever hold a special place in the history of Japan, its intellectual history, and the cultural history of the sword, as the incident in which, at a time when the Edo bakufu's rule was no longer unshakable, a single samurai took up sword and cannon in devotion to his convictions.