In the Battle of Sekigahara in 1600, he first joined the western force and participated in protection of Seta bridge in Omi Province and the siege of Tanabe-jo Castle in Tango no kuni (Tango Province), but he betrayed the western force and joined the eastern force after he was persuaded by Jyosui KURODA.
1600年の関ヶ原の戦いでは、はじめ西軍に与して近江国瀬田橋の守備や丹後国田辺城(丹後国)（舞鶴城）攻めに務めたが、後に黒田如水に誘われ、東軍に寝返った。