In 1345, he was appointed as Oshu Kanrei along with Kuniuji HATAKEYAMA, and went down to Taga-jo Castle, the kokufu (provincial office) of Oshu to assume the post, where he fought against the Southern Court army including the Kitabatake clan which had been developing anti-Northern Court activities based in Oshu.
貞和元年（1345年）、畠山国氏(奥州管領)とともに奥州管領に補任され、奥州国府の多賀城に下向・着任、奥州を拠点に反北朝(日本)活動を展開する北畠氏等南朝軍と戦う。