In 770, a chief of the Emishi/Ezo army was defeated in a battle with the Imperial army and was forced to retreat to his homeland, and in the following year, 771, a delegate from Bo-Hai Dynasty arrived at Noshiro of Dewa Province (modern day Noshiro City in Akita Prefecture).
宝亀元年（770年）には蝦夷の首長が賊地に逃げ帰り、翌2年の渤海使が出羽野代（現在の秋田県能代市）に来着した。