Because of the Matsuda clan's having built the unchallenged power in the western Bizen Province in around 1483, the Akamatsu clan, the Shugo, was wary of them, and Norikuni URAGAMI, a family member of Norimune URAGAMI, who was ordered to hunt down and kill them by Masanori AKAMATSU, attacked them.
文明_(日本)15年（1483年）頃には備前国西部に確固とした力を築いていたためか、守護の赤松氏から警戒され、赤松政則の追討の命を受けた浦上則宗の一族の浦上則国に攻め込まれることとなる。