When Taketoki KIKUCHI attacked Hidetoki HOJO of the Chinzei Tandai (a bakufu-appointed functionary in the Hakata region) in March, 1333, Sadatsune took the side of Hidetoki and Taketoki was killed in battle.
1333年（元弘3年/正慶2年）3月、菊池武時が鎮西探題の北条英時を攻めたとき、英時側について武時を敗死に追い込んだ。