 In January 1426, when war had been declared with Brittany, he took part in the raid into Brittany, penetrating as far as Rennes, and returning with the booty into Normandy.He fortified himself in St. James-de-Beuvron, near Avranches, which Richemont attacked in February.The besiegers were thrown into confusion by a successful sortie, and Richemont was forced to retreat to Rennes, leaving much spoil in the hands of the English.