Although Yoritomo was enraged suspecting that nobles and In were behind it, he was attentive to the Tohoku region too and sent the following letter to FUJIWARA no Hidehira of Oshu to send up a trial balloon.
頼朝は貴族・院が陰で操っている事を察して憤りながらも、東北へも意識を向け奥州の藤原秀衡に下記のような書状を送り、探りを入れている。