Editing Penda of Mercia (section)

== Alliance with Cadwallon and the Battle of Hatfield Chase ==
{{Main|Battle of Hatfield Chase}}

In the late 620s or early 630s, [[Cadwallon ap Cadfan]], the British (Welsh) king of [[Kingdom of Gwynedd|Gwynedd]], became involved in a war with Edwin of Northumbria, the most powerful king in Britain at the time. Cadwallon apparently was initially unsuccessful, but he joined with Penda, who is thought to have been the lesser partner in their alliance,<ref>Brooks, page 167.<sup>[[#References|7]]</sup></ref> to defeat the Northumbrians in October 633<ref name="fn_2" /> at the [[Battle of Hatfield Chase]]. Penda was probably not yet king of the Mercians, but he is thought to have become king soon afterwards, based on Bede's characterisation of his position. Edwin was killed in the battle, and one of his sons, Eadfrith, fell into Penda's hands.<ref name="fn_11" />

One manuscript of the ''Anglo-Saxon Chronicle'' says that following the victory at Hatfield Chase, Cadwallon and Penda went on to ravage "the whole land" of the Northumbrians.<ref>''Anglo-Saxon Chronicle'', Manuscript E, 633.<sup>[[#References|2]]</sup></ref> Certainly Cadwallon continued the war, but the extent of Penda's further participation is uncertain. Bede says that the pagans who had slain Edwin—presumably a reference to the Mercians under Penda, although conceivably it could be a derisive misnomer meant to refer to the [[Christian]] British—burned a church and town at [[Campodonum]],<ref>Bede, B. II, Ch. XIV.<sup>[[#References|8]]</sup></ref> although the time at which this occurred is uncertain. Penda might have withdrawn from the war at some point before the defeat and death of Cadwallon at the [[Battle of Heavenfield]], about a year after Hatfield Chase, since he was not present at this battle. Furthermore, Bede makes no mention of Penda's presence in the preceding siege and battle in which [[Osric of Deira]] was defeated and killed. Penda's successful participation in the battle of Hatfield Chase would have elevated his status among the Mercians and so enabled him to become king, and he might have withdrawn from the war before Heavenfield to secure or consolidate his position in Mercia. Referring to Penda's successes against the West Saxons and the Northumbrians, [[D. P. Kirby]] writes of Penda's emergence in these years as "a Mercian leader whose military exploits far transcended those of his obscure predecessors."<ref name="fn_9" />