. "3,000" . . . "Kingdom of Bernicia" . . . "Northumbria" . . . . "Battle of Hatfield" . . . "battle of Hatfield Chase" . . . "Kingdom of Deira" . "Battle of Heathfield" . . . "Mercia" . "700 killed or wounded" . "0633-10-12" . . "Anglo-Saxons" . "United Kingdom" . . . . "Gwynedd-Mercian victory" . . . "Hatfield Chase" . . "Battle of Hatfield Chase" . . "Kingdom of Northumbria" . . "Battle of Hatfield Chase" . . . "Britons" . "1,800" . . "Kingdom of Mercia" . . . "Hatfield" . . "Kingdom of Gwynedd" .