Then, he ordered his vassal Kanetsugu NAOE to invade the Yamagata-jo Castle owned by Yoshiaki MOGAMI who canceled the alliance with the Uesugi clan and made it clear that he would take side with Ieyasu.
そして、上杉氏との同盟を破棄して家康方に付くことを鮮明にした最上義光の山形城を家臣・直江兼続に攻め入らせた。