823
This year a battle was fought between the Welsh in Cornwall and the people of Devonshire, at Camelford; and in the course of the same year Egbert, king of the West-Saxons, and Bernwulf, King of Mercia, fought a battle at Wilton, in which Egbert gained the victory, but there was great slaughter on both sides. Then sent he his son Ethelwulf into Kent, with a large detachment from the main body of the army, accompanied by his bishop, Elstan, and his alderman, Wulfherd; who drove Baldred, the king, northward over the Thames. Whereupon the men of Kent immediately submitted to him; as did also the inhabitants of Surrey, and Sussex, and Essex; who had been unlawfully kept from their allegiance by his relatives. The same year also, the king of the East-Angles, and his subjects besought King Egbert to give them peace and protection against the terror of the Mercians; whose king, Bernwulf, they slew in the course of the same year.
(Ingram, p.58-59)