Since they were soundly defeated at the Battle of Sakainehara on January 11, 1479, they retreated bringing their troops together and holed up in Usui-jo Castle (present-day in Usuita, Sakura City), but the castle fell to Yoritane's side on August 11, 1479 and Yoritane brought most of Shimousa and Kazusa Provinces under his control.
文明10年（1478年）12月10日には境根原合戦で大敗、軍勢をまとめて退却し臼井城（現在の佐倉市臼井田）に籠城したが、文明11年（1479年）7月15日に臼井城は落城し、下総・上総国の大半は自胤に制圧された。