 There was already a royal army in Normandy besieging the town of Rolleboise, nominally commanded by the Count of Auxerre but actually generalled by Bertrand du Guesclin.Charles's designs were well known in advance and in early April 1364 this force seized many of Charles's remaining strongholds before the Captal de Buch could reach Normandy.When he arrived he started concentrating his forces around Évreux, which still held out for Charles.