652. Cenwealh of Wessex fights at Bradford-on-Avon
The Anglo-Saxon Chronicle notes only that Cenwealh fought at Bradford, without mentioning whom Cenwealh was fighting or who won. Æthelweard, in his Latin version of the Chronicle, notes that it was a civil war, and the location of Bradford makes it plausible that this was a fight between Cenwealh and Cuthred. (Bradford is west of Ashdown, and may well have been within the 3,000 hides near Ashdown that Cenwealh granted Cuthred in 648.) William of Malmesbury in the 12th century does not clearly refer to this battle, but he mentions two battles Cenwealh fought against the British, one at Vortigern's burg and one at Penne (GRA, i.19.2): the battle at Penne is clearly Cenwealh's fight against the British in 658 (at Peonnan), and it may be that the fight at Vortigern's burg is a confused reference to the fight in 652 (but see 665 for another possibility).
R. Mynors and others, William of Malmesbury: Gesta Regum Anglorum (Oxford: 1998)