 The Battle of Heathfield, fought in 633 between Penda of Mercia and Edwin of Northumbria may have occurred on Hatfield Chase, although it could also have taken place near Cuckney in Nottinghamshire, between Mansfield and Worksop, which also has places called Hatfield.Hatfield Chase lay above the confluence of three rivers, the Don, the Torne and the Idle, which meandered into the Trent near its entrance to the Humber.The whole of this area, apart from the Isle of Axholme, is less than above sea level and was therefore subject to frequent flooding.