When an internal strife called the Yamairi Uprising occurred within the Satake clan serving as Shugo, the Edo clan actively intervened in the strife, which intervention was a good excuse for the Edo clan to expand their sphere of influence to the Satake Domain.
その後、守護佐竹氏の内部で山入一揆と呼ばれる内訌が発生すると積極的に介入し、佐竹領にも進出するようになる。