In 1540, Haruhisa AMAGO accepted a demand from Nobuzane TAKEDA to subjugate the Mori clan, a local lord of Aki Province on the Ouchi side, and moved his forces.
天文9年（1540年）、大内氏勢力下にある安芸国人の毛利氏の討伐を、武田信実の要請を受け入れ晴久は出陣。