However, in June of the same year, Rokuhara Tandai (an administrative and judicial agency in Rokuhara, Kyoto) in Kyoto was captured by Takauji ASHIKAGA and others and the news of the dominance of anti-Shogunate army spread through Kyushu, then Sadamune with Sadatsune, the Shimazu clan and others broke away from Hidetoki and attacked and killed him.
しかし、同年5月に足利尊氏らによって京都の六波羅探題が攻略され、討幕軍優勢が九州にまで伝わると、貞宗は貞経や島津氏らと共に英時から離反してこれを攻め殺した。