In the Battle of Sekigahara in 1600, he joined with the Western Camp, and attacked Tanabe-jo Castle in Tango Province protected by Yusai HOSOKAWA of the Eastern Camp, and also worked as an envoy to surrender the castle to the enemy.
慶長5年（1600年）の関ヶ原の戦いでは西軍に与して東軍細川幽斎が守る丹後国田辺城(丹後国)を攻め、開城の使者も務めた。