Imagawa Yoshimoto

The Takeda, Hōjō, and Imagawa established an alliance through marriages among their children.

Takeda Harunobu and Nagao Kagetora faced each other across the Sai River for more than 200 days. Because Asahiyama Castle would not fall there was no decisive battle, and the two sides came to terms through the mediation of Imagawa Yoshimoto.

Imagawa Yoshimoto leads troops from Suruga, Tōtōmi, and Mikawa to invade Owari, capturing strongholds such as Odaka Castle and increasing pressure.