At this time, they planned to raise an army, and his third eldest brother Shingo and cousin Iwao OYAMA (Yasuke) along with Kunimoto SHINOHARA and Yaichiro NAGAYAMA were members of the extremist patriot group who stayed at Terakoya and other places.
この時に挙兵を企て、寺田屋、その他に分宿していた激派の中には三弟の信吾、従弟の大山巌（弥助）の外に篠原国幹・永山弥一郎なども含まれていた。