However, when Takauji, who had been hiding himself in Kamakura, raised an army, KO no Moroyasu followed him and thoroughly beat Yoshisada's force in the Battle of Hakone and Takenoshita, contributing to the victory of Takauji.
しかし鎌倉に逼塞していた尊氏が出馬するとこれに従い、義貞の軍を箱根・竹ノ下の戦いで大いに打ち破るという功績を挙げた。