In 1523, Koretoyo lost control of Katashida-jo Castle to Korenaga and his son, and they even took over control of Kosa Town, Tomochi Town, and Nakayama; however, Koretoyo regained control over the castle in 1543, finally ending the internal conflicts that had continued for 30 years.
1523年には惟長父子に堅志田城を奪われ甲佐町・砥用町・中山も支配下におかれるが1543年に堅志田城を奪還し、30年に及ぶ内部分裂に事実上終止符を打つ。