In the Kinmon Incident on July 19, he was responsible for strategy as a military commissioner and demonstrated his mastery of the Koshu-ryu military science in the capture of Mt. Tenno and so on.
7月19日の禁門の変では、軍事方として戦略担当幹部となり、天王山攻略などで甲州流軍学を発揮した。