In 1600, during the Battle of Sekigahara, at first he took part in the Western squad with his uncle Sadamichi INABA, however, later he switched to the side of Eastern squad.
慶長5年（1600年）の関ヶ原の戦いでは、叔父の稲葉貞通と共にはじめ西軍に属し、後に東軍に寝返った。