The Battle of Hatfield Chase (Old English: Hæðfeld; Old Welsh: Meigen) was fought on 12 October 633 at Hatfield Chase near Doncaster (today part of South Yorkshire, England). It pitted the Northumbrians against an alliance of Gwynedd and Mercia. The Northumbrians were led by Edwin and the Gwynedd-Mercian alliance was led by Cadwallon ap Cadfan and Penda. The site was a marshy area about 8 miles northeast of Doncaster on the south bank of the River Don. It was a decisive victory for Gwynedd and the Mercians: Edwin was killed and his army defeated, leading to the temporary collapse of Northumbria.
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