In the Battle of Komaki and Nagakute, Saikashu dispatched troops as far as around Osaka in cooperation with Negoroshu, and threatened the rear of Hideyoshi as he went to the front in Owari Province.
根来衆と組んで小牧・長久手の戦いでは大阪周辺にまで出兵して尾張国に出陣した秀吉の背後を脅かした。