After Yoshinaga killed himself in the attack of Motonari MORI in 1557 and the Ouchi clan went to ruins, the Otomo clan lost its power of influence in Suo Province.
さらに弘治(日本)3年（1557年）、義長が毛利元就に攻め込まれて自害し大内氏が滅亡すると大友氏は周防方面への影響力を失ってしまう。