In 1565, the Mitoya clan took part in the attack on the Gassantodajo Castle, which was the main castle of Amago clan, responsile for occupying the Sugaya-guchi entrance together with the Takakage KOBAYAKAWA's army.
そして永禄8年（1565年）の尼子氏の本城である月山富田城の攻撃にも小早川隆景軍に従って菅谷口の攻略を担当した。