John II of France had returned to London to negotiate with Edward III, and the defence of France was once more in the hands of the Dauphin. 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. He then led his army against the royal forces to the east. On 16 May 1364 he was defeated by du Guesclin at the Battle of Cocherel. John II had died in England in April, and news of the victory of Cocherel reached the Dauphin on 18 May at Rheims, where on the following day he was crowned Charles V of France. He immediately confirmed his brother Philip as Duke of Burgundy.