At that time, the daimyo of Aizu, Katamori MATSUDAIRA, who was charged with the defense of Kyoto, had started cooperating with the Satsuma clan, and set up a system to oppress the radical loyalist faction in Choshu.
当時、京都守護職であった会津藩主・松平容保は薩摩藩と連携して、長州の尊攘急進派を弾圧する体制を整えていたのである。