He temporarily defeated the Imagawa army, which was in confusion, in the Mizushima Incident in 1375, but lost again in a counter attack by Ryoshun, which led to a series of losing battles and finally to giving up his base castle in 1381.
1375年に水島の変で混乱していた今川軍を一時的に破ったこともあったが、その後は再び了俊の逆襲に晒されて連戦連敗、1381年には居城までも奪われてしまった。