In cooperation with Yoshihiro OUCHI Ryoshun contacted to emerging Kokujin (local lord) group, attacked the Kikuchi clan in Bungo Province with the cooperation of the Aso clan and attacked Dazaifu with the cooperation of the Matsuura Party and his own army attacked Dazaifu from the center.
大内義弘などの協力も得て貞世は新興の国人勢力と連絡し、阿蘇氏の協力を得て豊後の菊池を、松浦党の協力を得て大宰府を攻め、了俊自身の兵は中央から大宰府を攻めた。