On advice from Nagamasu YOSHIOKA, a member of his staff, from September to December of the same year Sorin entrusted his soldiers to Teruhiro who was dependent on the Otomo clan and ordered him to land secretly in Suo Province with the help of the Otomo navy headed by Shigeoki WAKABAYASHI.
宗麟の参謀である吉岡長増の進言により、宗麟は寄食していた輝弘に兵を与え、同年8月から9月にかけて、若林鎮興らの大友水軍を付けて、密かに海上から周防国に上陸させた。