In September of 1518, when threatening movements began showing in the Amago clan of Izumo Province and the Takeda clan of Aki Province, Yoshioki OUCHI returned home to Suo Province (modern day Yamaguchi Prefecture) due to the local lords under his command defecting one after another.
永正15年（1518年）8月、出雲国の尼子氏や安芸の武田氏などが不穏な動きを見せ、麾下の国人の離反も相次いだため、大内義興が周防に帰国する。