In February, 1339, the Southern Court army invaded Shimotsuke Province and captured Yagioka-jo Castle, where the Kito Mashiko clan--supporters of the Utsunomiya clan--had established their base, also taking Mashikoko-jo Castle, Kaminokawa-jo Castle and Minowa-jo Castle.
延元4年/暦応2年（1339年）2月、下野を攻め宇都宮氏を支える紀党益子氏の矢木岡城・益子古城・上三川城・箕輪城を攻略。