When Yorimasa and Nakatsuna took up arms with Prince Mochihito and died in the battle of Rising of Prince Mochihito, he was in Izu Province with Nakatsuna's second son, MINAMOTO no Aritsuna, and they joined the army to search out and destroy the Heishi (Taira clan).
頼政・仲綱らが以仁王と共に挙兵し討ち死にした時、仲綱の次子源有綱と共に知行国の伊豆国におり、伊豆で挙兵した鎌倉市の源頼朝の傘下で平氏追討軍に加わる。