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.
In 1352 a French army, commanded by Marshal Guy II de Nesle, invaded Brittany, and after recapturing Rennes and territories to the south was advancing northwest, towards the town of Brest.
2,000 men commanded by the Englishman Sir Walter Bentley and the Breton captain Tanguy I du Chastel.
With only a minute force, Sir Walter took up one of those strong defensive positions favoured by the English of the time, with men-at-arms on foot in a line, with archers in the customary "wedge" (one interpretation of Froissart's enigmatic word 'herce' which more probably means in a 'zig-zag' rather than wedge-shaped deployment) formation on the wings.
The Franco-Breton forces attacked late in the afternoon and the English longbowmen inflicted mass carnage on the French horses, their dismounted riders being dispatched by the men-at-arms as they struggled to get to their feet under the weight of their armour.