Battle of St Fagans
1648 CE.
Shown on the map at 51.486°, -3.273°.
The Battle of St Fagans took place on 8 May 1648 near St Fagans in South Glamorgan, during the Second English Civil War. A detachment from the veteran Parliamentarian New Model Army defeated a Royalist force primarily composed of mutinous former Parliamentarian soldiers, and ill-equipped levies. Their defeat ended significant Royalist resistance in Wales.
Text from the Wikipedia article Battle of St Fagans, licensed CC BY-SA 4.0.