As the target of Yoritomo was not Yoshitsune any more but Oshu itself, Hiraizumi was attacked by a large force of Kamakura into easy surrender in the Battle of Oshu, by which the 100-year prosperity of the three generations of the Oshu Fujiwara clan came to an end.
頼朝の目的はすでに義経ではなく奥州であり、奥州合戦で鎌倉の大軍に攻められた平泉はあっけなく陥落し、奥州藤原氏三代・百年の栄華は幕を閉じた。