The Battle of Hatfield Chase (Old English: Hæðfeld; Old Welsh: Meigen) was fought on 12 October 633[1] It pitted the Northumbrians against an alliance of Gwynedd and Mercia.

[dubious – discuss] It was a decisive victory for Gwynedd and the Mercians: Edwin was killed and his army defeated, leading to the temporary collapse of Northumbria.

Cadwallon continued to wage a war against the Northumbrians, and was not stopped until he was defeated by Oswald at the Battle of Heavenfield (also known as Deniseburna, AC : Cantscaul) a year after Hatfield.

[7] An investigation group has challenged the alleged site of the battle, mooted as being near Doncaster, South Yorkshire, suggesting an alternative location of nearby Cuckney, Nottinghamshire, at a place called locally High Hatfield, with an ancient name of 'Cukeney upon Hattfeild'.

In April 2018 the group was awarded a further £58,000 from lottery funding and a private donation, to cover costs of LIDAR scanning and opening archaeological trenches in fields surrounding church land.