Mochimasa IKEDA who was recommended by the Sonjo-ha party became the lord of the domain on March 26, 1863, but gradually strayed and when Yoshinobu TOKUGAWA, his real older brother, became Seiitaishogun (great general), Mochimasa retired from the procurement work between the Shogunate and the Imperial Court, and after the incident that Atsunobu SHINJO, Hiromichi TSUDA, Shigemichi HIRAI, etc. in the procurement side of state affairs (Sonjo-ha) pressed Mochimasa to retire and threatened him by the sound of a cannon from Bansei Pass (Bansei, Okayama City) to the Okayama-jo Castle, Mochimasa ordered thier dismissal of the role and house arrest, but Gonrokuro mediated to release from the house arrest.
文久3年（1863年）2月8日に尊攘派に推されて藩主になった池田茂政であるが次第に迷走するようになり、実兄の徳川慶喜が征夷大将軍になると一切の朝幕間周旋の仕事から身を引いたため、国事周旋方（尊攘派）の新庄厚信・津田弘道・平井重道らが隠居を迫り万成峠（岡山市万成）から岡山城へ大砲の音を鳴らして威嚇する事件があり、茂政より役目罷免・蟄居謹慎を命ぜられたが権六郎が執りなして蟄居謹慎を解かせた。