However, Ieyasu TOKUGAWA of Mikawa Province, who was an ally of the Oda clan, intensified his offensive after the Battle of Nagashino, forcing Katsuyori to frequently send his troops to battle.
しかし、織田氏の同盟者である三河国の徳川家康は長篠以降、武田氏に対し攻勢を強め、勝頼はたびたび出兵を余儀なくされた。