During the Boshin War that broke out in January 1868, Jingoro took part in the Battle of Toba-Fushimi, the Battle of Koshu-Katsunuma and the Aizu War, and he subsequently headed for Sendai City where he joined Takeaki ENOMOTO's fleet and went to Ezo by ship.
慶応4年（1868年）1月に戊辰戦争が勃発すると、鳥羽伏見の戦い、甲州勝沼の戦い、会津戦争を経て仙台で榎本武揚艦隊と合流し、蝦夷地へ渡航した。