Seeking to acquire Totomi Province in future, the Tokugawa family was in desperate need of the battle in which to defeat the Takeda family while Oda's powerful reinforcements were still available.
徳川家としては、今後の遠江攻略を視野に入れると、今回是非とも合戦を発生させて、強力な織田の援軍のいる時に武田を叩いておきたいという考えがあった。