At the the Battle of Sekigahara which occurred in September 1600, he sided with the East squad led by Ieyasu TOKUGAWA, lined up around Mt. Nangu and diverted the West squad such as Hidemoto MORI and Masaie NAGATSUKA.
慶長5年（1600年）9月の関ヶ原の戦いでは徳川家康率いる東軍に属し、南宮山付近に布陣して毛利秀元、長束正家などの西軍勢を牽制した。