Kinmon Incident

Kinmon Incident 禁門の変・蛤御門の変
Part of Bakumatsu conflicts
An 1893 woodblock print by Yūzan Mori, depicting the Hamaguri rebellion.
Date August 20, 1864 Location Kyoto Result Shogunal victory
Belligerents
Chōshū Domain Sonnō Jōi Rōnin force	Tokugawa shogunate Aizu Domain Satsuma Domain Mito Domain Owari Domain Kii Domain Kuwana Domain Ōgaki Domain Echizen Domain Hikone Domain Yodo Domain Asao Domain Shinsengumi Mimawarigumi Yūgekitai
Commanders and leaders
	Tokugawa Yoshinobu
Strength
3,000 men (1,400 Chōshū army + 1,600 Rōnin force)	50,000 men
Casualties and losses
400 killed or wounded	60 killed or wounded, 28,000 houses burnt down

The Kinmon Incident (禁門の変, Kinmon no Hen, literally, "Forbidden Gate Incident" or "Imperial Palace Gate Incident"), also known as the Hamaguri Gate Rebellion (蛤御門の変 Hamaguri Gomon no Hen, "Hamaguri Imperial Gate Incident") was a rebellion against the Tokugawa Shogunate that took place on August 20, 1864, at the Imperial Palace in Kyoto. It reflected widespread discontent among pro-imperial and anti-foreigner groups, who rebelled under the Sonnō Jōi slogan. Sonnō Jōi had been promulgated by the Emperor as the "Order to expel barbarians" in March 1863, and the rebels sought to take control of the Emperor to accomplish the restoration of the Imperial household to political supremacy.

During the bloody crushing of the rebellion, the leading Chōshū clan was held responsible for its instigation. During the incident, the Aizu and Satsuma domains led the defense of the Imperial palace.

The Shogunate followed up the incident with a retaliatory armed expedition, the First Chōshū expedition, in September 1864.