Knowing that Kenshin, who withdrew to Echigo Province, suffered huge damage in the Fourth Battle of Kawanakajima against Shingen TAKEDA, Ujimasa coordinated with Shingen to invade the northern Kanto region and took back most of the territory seized by the Uesugi army.
越後に撤退した謙信が第4次川中島の戦いで武田信玄と戦って甚大な被害を受けると、信玄と呼応して北関東方面に侵攻、上杉方に奪われた領土の大半を奪い返した。