After Takanobu was defeated and killed by the army of the Shimazu clan in the Battle of Okitanawate in 1584, Sorin ordered Dosetsu TACHIBANA to invade Chikugo Province and regained the majority of the province.
天正12年（1584年）に沖田畷の戦いで隆信が島津軍に敗死すると立花道雪に命じて筑後国侵攻を行い、筑後国の大半を奪回した。