In 1866, he was appointed as a head of the cannon party of Yang Fire Tiger Maru by Shinsaku TAKASUGI, governor of the Domain navy, in Second conquest of Choshu, making a surprise attack on the warship of Bakufu in June of the same year.
慶応2年（1866年）、第二次長州征伐では藩海軍総督の高杉晋作から丙寅丸の砲隊長に任命され、同年6月、周防大島沖で幕府軍艦を奇襲攻撃。