After Tsunehisa AMAGO of Izumo Province died in 1541, Yoshitaka led Harumochi and others to invade Izumo in January, 1542; however, the Ouchi force was devastated due to the betrayal of Hisasuke MITOYA and Tsunemitsu HONJO, and as a result, Yoshitaka and Harumochi decided to retreat to Suo by different ships.
1541年に出雲国の尼子経久が没すと、義隆は1542年1月に晴持らを率いて出雲に出陣したが、三刀屋久扶、本城常光らの寝返りで大内軍は総崩れとなり、義隆と晴持は別々の船で周防に退却することになった。