Battle of Mauron
1352 CE.
Shown on the map at 48.089°, -2.262°.
The Battle of Mauron was fought in 1352 in Brittany during the Breton War of Succession between an Anglo-Breton force supporting the claim of Jean de Montfort and a Franco-Breton force supporting the claim of Charles de Blois. The Anglo-Bretons were victorious. The battle took place in the context of the Hundred Years War.
Text from the Wikipedia article Battle of Mauron, licensed CC BY-SA 4.0.