Therefore, while Tadaoki HOSOKAWA was joining the army to attack the Aizu Domain as a member of the eastern army, Mitsunari ISHIDA raised an army of 15,000 soldiers mainly consisting of various Daimyo of Tanba Province and Tajima Province, such as Shigetsugu ONOGI (Kimisato ONOGI), Shigekatsu MAEDA, Nobukane ODA, Yoshimasa KOIDE, Nagafusa SUGIHARA, Moritomo TANI, Nagakatsu FUJIKAKE and Nagamasa HAYAKAWA, all of whom were members of the western army, to attack and capture Tanabe-jo Castle.
このため、東軍に与して会津攻めに参加していたのだが、石田三成はその田辺城を制圧するために、西軍に与した小野木重次（小野木公郷）・前田茂勝・織田信包・小出吉政・杉原長房・谷衛友・藤掛永勝・早川長政ら、丹波国・但馬国の諸大名を中心とした軍勢、1万5000人に攻撃させたのである。