Details of fighting in this expedition were not recorded in historical materials other than "Ruiju Kokushi" (classified national history) which mentioned that 'the expeditionary army of the deputy general SAKANOUE Osukune Tamuramaro conquered Ezo barbarians.'
この戦役については「征東副将軍坂上大宿禰田村麿已下蝦夷を征す」（『類聚国史』）と記録されているが他の史料がないため詳細は不明である。