When he was informed that Rokuhara Tandai officers (chief officers of the Kamakura bakufu in Kyoto whose agency was responsible for security of Kinai, judicial affairs in western Japan, and also for any negotiations with the Imperial Court) were killed by Takauji ASHIKAGA, Sadatsune betrayed Hidetoki and had him killed in a battle.
しかし六波羅探題が足利尊氏によって落とされたことを知ると、英時を裏切って、今度はこれを敗死に追い込んだ。