It was to be in these circumstances that MINAMOTO no Yoritomo who had been exiled to Izu Province raised an army in August of the same year was defeated in the Battle of Ishibashiyama but while marching from Awa Province, to which he had fled, to Kazusa Province and Shimousa Province, he gained the support of a Taira clan lineage samurai group (Bando-Heishi clan) active throughout the Kanto region.
そうした状況の中で、伊豆国に流罪となっていた源頼朝は、同年8月に挙兵し石橋山の戦いで敗れたが、逃亡先の安房国から上総・下総を行軍する間に、関東一円の平氏系の武士団（坂東平氏）らの支持を獲得した。