When the father and his son, Takauji and Yoshiakira, surrendered to the Southern Court to settle disputes inside the bakufu, Sadahisa and Munehisa reverted together to the Southern Court and attacked Naofuyu.
幕府内の混乱を収めるため尊氏・義詮親子が南朝方に降伏すると、貞久・宗久ともに南朝に帰属、直冬を攻撃した。