In March, 1573, when Nobunaga and Shogun Yoshiaki were opposed to each other and soldiers garrisoned forts in Ishiyama and Imakatata, four busho including Katsuie attacked and defeated them.
天正元年（1573年）2月、信長と将軍・義昭が対立して石山と今堅田の砦に兵を入れると、勝家を含めた4武将が攻撃してこれらを陥落させた。