When the Ikedaya Incident occurred in July, he, as a Shoshi shirabeyaku ken kansatsu of Shinsengumi, searched for, along with Kai SHIMADA, the retainers of Choshu domain and radical members of Sonjo-ha (a group advocating reverence for the Emperor and the expulsion of foreigners) and succeeded in locating Masuya, the residence of Shuntaro FURUTAKA, one of the radical members.
6月の池田屋事件の時は諸士調役兼監察として島田魁らと長州藩士や尊攘過激派の探索にあたり、見事、尊攘過激派の一人、古高俊太郎宅・枡屋を突き止めている。