Battle of Wilton
1143 CE.
Shown on the map at 51.080°, -1.864°.
The Battle of Wilton was a battle of the civil war in England known as The Anarchy. It was fought on 1 July 1143 at Wilton in Wiltshire. An army under King Stephen was stationed at Wilton Abbey, where it was attacked by an army led by Robert Earl of Gloucester. Although King Stephen's army was defeated, the king himself escaped capture.
Text from the Wikipedia article Battle of Wilton, licensed CC BY-SA 4.0.