The troops of Kageie killed Prince Mochihito, who raised an army for overturning the Taira clan and was defeated, so Yoshitsune virtually avenged the Prince.
景家の軍勢は打倒平氏の兵を挙げたのち敗れた以仁王を討ち取っており、義経はいわば王の仇を討った事になる。