In 1540, Motonari's bastion, Yoshida-Koriyama Castle was assailed by an army of 30,000 men led by Haruhisa AMAGO (who was the heir of Tsunehisa) in what is known as the Battle of Yoshida-Koriyama Castle.
天文9年（1540年）には経久の後継者である尼子晴久率いる3万の尼子軍に本拠地・吉田郡山城を攻められる（吉田郡山城の戦い）。