However, the Otomo clan suffered a crushing defeat in the Battle of Mimi-kawa with the Shimazu clan and breakaway of many vassals and kokujin under its control repeatedly resulted in a quick decline of the Otomo clan.
しかし大友氏は島津氏との耳川の戦いで大敗、家臣や幕下の国人の離反が相次いで急速に衰えていく。