The Imperial Court planned to oust the Sonjo Group by force, and in the coup of August 18, the Satsuma clan and the Aizu clan joined forces to expel the Choshu clan as well as the court nobles of the Sonjo Group.
朝廷では実力による尊攘派の一掃を図り、八月十八日の政変で薩摩藩が会津藩と結託して長州藩や尊攘派の公家らを追放した。