In regard to this incident it was initially presumed that Hojo clan made a countercharge, since their private land had been taken away in the Battle of Koan; however, it was subsequently discovered that Sanemori SANJO was involved, and there was suspicion that the retired Emperor Kameyama had agitated the matter behind the scenes.
この事件は初め、北条氏による弘安合戦により所領を没収された事による反抗かと思われたが、後に三条実盛の関与が発覚し、亀山上皇が裏で策動していたと言う疑惑があった。