During the general offensive on Hakodate on June 20, Kuroda commanded a small group of troops and occupied Mt. Hakodate to the rear before driving the enemy into Goryokaku.
11日の箱館総攻撃では、自ら少数の兵を率いて背後の箱館山を占領し、敵を五稜郭に追い込んだ。