In Kamakura bakufu, Yasumori who was supported by tozama gokenin (nonhereditary lower-ranking vassal in the Kamakura period) competed against Tokuso's vassal party led by Yoritsuna.
幕府では外様御家人を支持勢力とする泰盛と、頼綱を筆頭とする得宗被官勢力が拮抗していた。