In 1600, after Hideyoshi's death, when Ieyasu Tokugawa, a member of the Gotairo (Council of Five Elders), rose in arms against another member of the Gotairo, Kagekatsu UESUGI, in Aizu, he took part in the campaign.
秀吉死後の慶長5年（1600年）に、五大老の徳川家康が同じく五大老の一人だった会津の上杉景勝討伐の兵を起こすと従軍した。