Battle of Hatfield Chase (633) Battle of Hatfield Chase A decisive early medieval battle in northern England on 12 October 633 where an alliance led by Penda of Mercia and Cadwallon of Gwynedd defeated King Edwin of Northumbria.
Battle of the Winwaed (655) — clash between Penda of Mercia and Oswiu of Northumbria Battle of the Winwaed Decisive 15 November 655 battle in which King Oswiu defeated Penda of Mercia; it ended Mercian hegemony and altered the balance of power in early Anglo‑Saxon England.
