The battle of Morlaix was fought near the village of Lanmeur in Brittany, France, on 30 September 1342 between an Anglo-Breton army and a much larger Franco-Breton force. England, at war with France since 1337 in the Hundred Years' War, had sided with John of Montfort's faction in the Breton Civil War shortly after it broke out in 1341. The French were supporting Charles of Blois, a nephew of the French king.