After Hideyoshi TOYOTOMI died, the opposition between Ieyasu TOKUGAWA, who set out to rule the world, Mitsunari ISHIDA, a defender of the Toyotomi clan and member of the anti-Ieyasu group, came to the forefront in the wake of the attack on Aizu in 1600.
豊臣秀吉の死後、天下人の座を狙う徳川家康と、豊臣氏擁護の立場から家康と対立する石田三成ら反家康派の対立は、慶長5年の会津攻めを契機として表面化する。