In 1572, when Shingen started the strategy to conquer westward (There is a different version of the story, please refer to the Battle of Mikatagahara), he joined the battle as the commander of a troop, and accomplished military exploits again in the Battle of Mikatagahara in December by fighting against the Oda and Tokugawa allied forced and defeating them.
元亀3年（1572年）、信玄が西上作戦（異説あり。三方ヶ原の戦い参照）を開始すると、一隊の大将として参戦し、12月の三方ヶ原の戦いでも織田・徳川連合軍と戦い、これを破るという武功を挙げた。