In the Jinshin War of 672, he changed sides to support Oama no Miko (Prince Oama, later Emperor Tenmu) and led the troop on a northern route along Lake Biwa to take over the Mionoki Castle.
672年の壬申の乱で大海人皇子（天武天皇）側に寝返り、琵琶湖北回りの軍を率いて三尾城を攻略した。