The Battle of Auray took place on September 29, 1364, during the Breton War of Succession. This conflict was primarily between the forces of Charles de Blois, who claimed the Duchy of Brittany, and John de Montfort, a rival claimant. The battle was significant as it marked a turning point in the struggle for control over Brittany. The battle ended in a decisive victory for John de Montfort, leading to his recognition as the Duke of Brittany. This victory helped solidify the Montfort family's power in the region and contributed to the ongoing tensions between the French and English crowns during the period.