This was because he took the side of the Western squad along with his oldest son, Yoshimasa, in the Battle of Sekigahara in 1600, where he attacked Tanabe-jo Castle in Tango Province protected by Fujitaka HOSOKAWA (also known as Yusai HOSOKAWA) of the Eastern squad.
その経緯から、1600年の関ヶ原の戦いでは長男の吉政と共に西軍に与して、東軍に与した細川幽斎（幽斎）の守る丹後国田辺城(丹後国)を攻撃した。