After the fall of the Amago clan, Yukimori YAMANAKA and Katsuhisa AMAGO organized an army to invade Izumo for the restoration of the Amago clan, which raised the morale among the old Amago retainers and induced local land lords and local ruling families to join the restoration army.
尼子氏の滅亡後に、山中幸盛や尼子勝久が尼子再興軍として出雲への侵攻を図り、旧尼子家臣団にも動揺が走り、再興軍に加わる国人や豪族が続出した。