Although he adopted an independent position initially, he later achieved distinguished war service during the Battle of the Fuji River in cooperation with Minamoto no Yoritomo and was appointed as shugo of Suruga Province.
当初は独立的立場を取っていたが、富士川の合戦を期に源頼朝に協力して戦功をあげ駿河国守護を任ぜられる。