With regard to the issue of the activities of the Shogitai (group of former Tokugawa retainers opposed to the Meiji government who fought in the Battle of Ueno) which focused on the former shogun's retainers, Senpei and Masujiro OMURA advocated the subjugation of the group and he fought as a Assistant Deputy General at the Battle of Ueno drive the Shogitai forces to the area surrounding Kanei-ji Temple in Ueno, before forcing the Shogitai to break up by using tactics such as long range gunfire from Armstrong Guns.
旧幕臣らを中心とする彰義隊が活動していた問題では大村益次郎らとともに討伐を主張し軍監として上野戦争で戦い彰義隊勢を上野寛永寺周辺に追い詰め、さらに佐賀藩のアームストロング砲を遠方射撃する戦術などにより彰義隊は瓦解する。