But to prevent the troop of Nobuharu BABA, who was a busho of the Takeda clan, from penetrating his allies, he left future affairs in the hands of his younger brother Masakazu NARUSE (busho in the Sengoku period), and sacrificed himself for Ieyasu and died in the battle.
だが、武田氏の武将・馬場信春隊の突入を防ぐために、後事を弟・成瀬正一(戦国武将)に託し、家康の身代わりとして討ち死にした。