Fukushima Masanori
Even after the battle began, Kobayakawa kept his intentions hidden. Ieyasu's force (east) was not faring well against Mitsunari's force (west); Ukita Hideie was winning against Fukushima Masanori and Ōtani Yoshitsugu was also winning against Tōdō Takatora. Kobayakawa was hesitant to participate with either side. Ieyasu ordered troops to fire blanks against the Kobayakawa troops to force them into action. Kobayakawa then ordered an attack on the Otani troop and while this attack was beaten back temporarily, his action forced the other armies who had pledged betrayal to also turn. The battle was over within a day.