At this time, the Choshu Domain dealt with nobles loyal to the emperor in Kyoto in order to control the Imperial Court, while as assassination cases, known as Tenchu (heaven's punishment) occurred frequently.
この頃、京都では長州藩が攘夷派公卿と結んで朝廷を牛耳り、天誅と呼ばれる暗殺事件が頻発していた。