In the same year, Ideha district (later Dewa Province) was establshed in Dewa Province, and the subjection of indigenous inhabitants in north-eastern Japan, using Dewa Castle as the home ground, was started.
また同年、越後国に出羽郡（後の出羽国）が設置され、出羽柵を中心に蝦夷征討が開始した。