Although Iechika MIMURA, by approaching the Mori clan in Aki Province, who ruled the Chugoku region in place of the Amago clan in Izumo Province, expanded his territories to Bizen Province and Mimasaka Province, he was assassinated by Naoie UKITA, who was under the Urakami clan in Bizen, followed by the Mimura clan's loss at the Battle of Myozen-ji Temple and their decline.
三村家親は、出雲国尼子氏に代わって中国地方の覇者となった安芸国毛利氏に接近し勢力を備前国、美作国に広げたものの、備前浦上氏の傘下の宇喜多直家により家親が暗殺され、つづく明善寺合戦において三村氏は敗退、その勢力は衰えた。