In 1600, when Mitsunari and his followers took up arms against Ieyasu TOKUGAWA, who was a member of the Council of Five Elders, the Budan-ha faction sided with Ieyasu leading to the Battle of Sekigahara.
慶長5年（1600年）には五大老の徳川家康に対し三成方が挙兵し、武断派は家康方に荷担し関ヶ原の戦いに至る。