On August 27 (表記の変更), the army of Choshu Domain captured Hamada-jo Castle, which caused the flight of the regional governor of Omori Ginzan (silver mine) dispatched from Edo bakufu on August 30 (表記の変更), and after Kokura-jo Castle was abandoned by Kokura Domain on September 1(表記の変更) (occupied by the army of Choshu on September 19 [表記の変更]), various uprisings broke out simultaneously within Kokura Domain.
ところが7月18日に浜田城が長州藩軍に落とされ、21日には大森の幕府代官が逃走、8月1日には小倉藩が小倉城を放棄（11日に長州藩軍に占領）すると、その領内で一斉に一揆が発生した。