Caused by the Emperor Godaiko's anti-shogunate movement, the Genko War started in 1333 which Takauji ASHIKAGA destroyed the Kamakura bakufu; by this time, however, Tokichika MORI had already defected from the bakufu and did not participate in the Kenmu no Shinsei (The new government of the Emperor Godaigo).
1333年(元弘3)に後醍醐天皇の討幕運動から元弘の乱が起こり、足利尊氏らが鎌倉幕府を滅亡させるが、毛利時親は幕府から離反しており、後醍醐天皇により開始された建武の新政からも距離を置いている。