- Date: 1866/9/22
- Place: Near Sanjo bridge, Kyoto
- Japanese: 三条制札事件 (Sanjo Seisatsu Jiken)
There was a Seisatsu which accused Choshu han as the enemy of the Imperial court near Sanjo bridge. 1866/8/28, the Seisatsu was pulled and trashed on the side of Kamo river. 9/2, new Seisatsu was put but was gone in 3 days.
9/10, Bakufu put new Seisatsu and ordered the Shinsengumi to keep watching it.
The Shinsengumi sent 34 members in three parts.
- Oishi Kuwajiro's unit-10
- Arai Tadao's unit-12
- Harada Sanosuke's unit-12