In the Battle of Komaki and Nagakute in 1584, his behavior received attention, and he finally took part on the side of Hideyoshi against Ieyasu TOKUGAWA from Mikawa Province and Nobukatsu (Nobuo) ODA.
天正12年（1584年）、三河国の徳川家康、織田信雄との小牧・長久手の戦いでは、去就が注目されたが結局は秀吉方として参戦。