At the time of Boshin Civil War, Teisaku and Masakatsu YAMAWAKI killed Gonzaemon YOSHIMURA who was a chief retainer of the deference faction, ordered by their lord, Sadaaki MATSUDAIRA.
戊辰戦争時、藩主・松平定敬の命を受けて、山脇正勝と共に恭順派の家老・吉村権左衛門を殺害。