In an entry dated 827 the Anglo-Saxon Chronicle states "Egbert led an army against the Northumbrians as far as Dore, where they met him, and offered terms of obedience and subjection, on the acceptance of which they returned home" (transcription). Most sources (for example Vickers, Old Sheffield Town) state that the date given in the chronicle is incorrect, and that 829 is the more likely date for this event.
