At the Battle of Sekigahara (1600), he and his heir Hirotsuna KAWAKATSU joined the West Army, and fought in the attack against Tanabe-jo Castle in Tango Province (the Battle at Tanabe-jo Castle).
慶長5年（1600年）の関ヶ原の戦いでは、嫡男川勝広綱とともに西軍に与して丹後国田辺城(丹後国)攻撃（田辺城の戦い）に参加した。