In Musashi province, there were many samurai groups such as the Kodamas who were related to the Hiki clan, the powerful local ruling family that died out in the Conspiracy of Yoshikazu HIKI; Tokimasa's attempt to conquer Musashi province after the demise of the Hiki clan meant entering territory controlled by Shigetada as the head of the samurai groups in Musashi, and Tokimasa and Shigetada came to have arguments over the conspiracy.
比企能員の変で滅ぼされた有力豪族比企氏の縁戚児玉党など、武蔵国には比企氏と繋がりをもつ者が多く、比企の跡を勢力下に収めようとした時政の武蔵進出は、武蔵武士団の棟梁である重忠の勢力圏への進入であり、比企の乱後の戦後処理を巡って時政と重忠は対立する関係となっていたのである。