However, the seitogun (expeditionary force) struggled to find an efficient attack against Aterui in Isawa-jo Castle, the force of Ezo (the Early Modern Japanese to describe the island of Hokkaido and the people who lived there) of Shiwa County and Waga County.
しかし征討軍は胆沢城のアテルイほか紫波郡、和賀郡の蝦夷勢に対し攻めあぐねた。