| When Shinsengumi members were made the Shogun's retainers in July 1867, Oishi was assigned the responsibility for investigating the adversary movements and keeping the Shinsengumi members under surveillance. |
慶応3年（1867年）6月 新選組が幕臣に取り立てられると、大石は諸士調役兼監察に任命された。 |