1540: Siege of Yoshida-Koriyama
Amago Haruhisa attacked Yoshida-Koriyama Castle in Aki, but Mōri Motonari successfully defended it with Ōuchi reinforcements. The conflict between the Amago and Mōri in Chūgoku became clear.
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Month 9
Amago Haruhisa attacked Yoshida-Koriyama Castle, but Mōri Motonari defended it with Ōuchi reinforcements.
See this battle in detail →Sources 安芸高田市「郡山城跡（吉田町）」／安芸高田市「青光井山尼子陣所跡（吉田町）」
Amago Akihisa's forces invaded Aki Province. They constructed a fortified encampment at Kazakoshi Mountain, approximately 4 km in a straight line from Kōriyama Castle, which served as their initial headquarters.
Sources 安芸高田市「風越山城跡」
Akihisa's forces constructed a massive fortified encampment over four months on the adjacent peaks of Aoyama and Mitsui Mountain across a valley from Kōriyama Castle.
Sources 安芸高田市「青光井山尼子陣所跡」