After this speech, the herald returned to his lord, and repeated to him what the dauphin had said, which made no great impression on the duke, for he considered it as the speech of those who governed the king. When the duke perceived that he could not gain admittance to Paris, and that his partisans in that city were unable to perform what they had promised him, he decamped from Mont-Chastillon, with his whole army, to lay siege to Montlehery. The inhabitants, knowing the power of the duke, and thinking they should not be supported, entered into a treaty to surrender the castle, if within eight days they were not succoured by the king or the constable. They sent information of this treaty to the constable, but it was of no avail, for no succours were sent,--and they delivered up the castle conformably to their agreement. In like manner were reduced to the obedience of the duke of Burgundy the castles of Marcoussy, Dourdan, Palaiseau, and some other forts in the neighbourhood. During the siege of Montlehery, the duke detached a part of his army to the castle of Doursay, who lodged themselves in the town, in front of the castle, and there pointed some cannons to batter the walls and conquer it; but a large body of the constable's men attacked their quarters at break of day, and slew the greater part of them. Those who escaped fled to the quarters of the duke of Burgundy, crying, 'To arms! for that the enemy were marching in great force against them.' The duke instantly drew up his army in battle-array on the plain, as if the enemy had been in sight. The leaders of the detachment sent to Doursay were the lord de Salines, the lord de Toulongeon, and some other captains from Burgundy; and at this surprise were made prisoners sir Geoffroy de Villers, a knight from the Rethelois, with fifty other gentlemen. While this was going forward, the duke dispatched sir Elyon de Jacqueville John de Guigny, John du Clau, and other captains, with sixteen hundred combatants to Chartres,--which place with Estampes, Gallardon, and other towns and forts, surrendered to the duke of Burgundy. Jacqueville remained governor of Chartres. In like manner, sir Philip de Fosseux and Robert le Roux were sent to the lady de la Riviere at Auniau, who promised that she would not admit any garrisons into her forts of Auniau and Rochefort, that would carry on war against the duke of Burgundy or his wellwishers. At this time, numbers of towns, castles, and noble men joined the duke, in the expectation that he would succeed in his enterprise and obtain the government of the kingdom. In the towns which submitted to his obedience, he would not allow any taxes to be raised excepting that on salt, which gained him great popularity among the inhabitants and peasantry of the countries round. He also sent letters to many of the principal towns in France, of the following tenour.