Tokimasa HOJO's next target after overthrowing senior vassals, the Kajiwara and Hiki clans was Shigetada HATAKEYAMA who had strong power in Musashi Province.
梶原氏、比企氏と有力御家人を滅ぼした北条時政の次の標的は、武蔵国に大勢力を誇る畠山重忠であった。