After the threat from the YAMANA clan was gone, Muramune re-started a feud with the Akamatsu clan over the supremacy and forced Masamura from Okishio-jo Castle to Mimasaka province while fighting with influential families of the Uragami clan such as Murakuni URAGAMI.
山名氏の脅威が去った後は、赤松氏との覇権を巡る争いを再開し、浦上村国など一族の有力者と争いつつ、政村を置塩城より追放し、美作国へ追いやったこともある。