Hamaguri rebellion
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The rebellion at the Hamaguri Gate (蛤御門の変 Hamagurigomon no Hen) of the Imperial Palace in Kyōto took place on August 20, 1864 and reflected the discontent of pro-imperial and anti-alien groups. During the bloody crushing of the rebellion, the leading Chōshū clan was held responsible for it.
During the incident, the Aizu and Satsuma domains led the defense of the Imperial palace.