Madog had his spearmen formed into a square, and may have repelled an English cavalry charge, killing around 10 men at arms.

A primary source for the Battle is the Annals of Worcester : Quinto die Martii Willelmus de Bello Campo comes Warewik commisit bellum cum Wallensibus in loco quod dicitur lingua eorum Meismeidoc ; et prostravit ex illis de nobilioribus septingentos viros præter submersos et letaliter vul neratos.

[1] "On 5th March William de Beauchamp, Earl of Warwick, gave battle with the Welsh in the place which is called in their proper tongue Meismedoc; and of whom he slew from those seven hundred noble men drowned and fatally wounded.

A second, smaller engagement near a place that the English records call 'Thesseweit' - the location of which remains uncertain - resulted in the loss of Madog's supply train.

The battle was a crucial step in breaking Welsh resistance in the revolt; Madog was run to ground and captured in late July 1295.