In 1341, the Southern Court army captured Tobiyama-jo Castle, which was the base for the the Seito Haga clan (who were descended from the Kiyohara clan), who were also Utsunomiya clan supporters, and thus annihilated both of the enemy's flanks.
興国2年/暦応4年（1341年）には宇都宮氏を支える清党・芳賀氏の飛山城を攻略し宇都宮氏の両翼を挫いた。