They were frequently summoned to surrender, but would not listen to the summons, for they had not a doubt but that they should be very shortly succoured. At length, the besiegers having learnt that the duke of Burgundy was marching against them, and that they must stand the chance of a battle, were panic-struck, and so great was their fear that they marched away about midnight for their own garrisons, leaving their cannon, bombards, and all their stores behind. Information of this was instantly dispatched to the duke and sir John de Luxembourg, who made all diligence to attack them, and the duke marched his whole army to Noyon. In these days sir John de Luxembourg advanced against Beauvais, and on the countries of the enemy, particularly against sir Louis de Vaucourt and his men, who had remained there for a considerable time during the winter, and set fire to a castle which they had repaired. The enemy retired within the town of Beauvais; and sir John encamped before the castle of Prouveulieu, which some Englishmen had refortified, and, by their excursions from thence, frequently oppressed the town of Mondidier, and the territories of the duke of Burgundy. They were soon forced to submit to sir John, who had the greater part executed and the rest sent to different prisons: having done this, he returned to the duke of Burgundy at Noyon. CHAP. LXXXIV. THE DUKE OF BURGUNDY LAYS SIEGE TO THE CASTLE OF CHOISY, WHICH HE CONQUERS IN A FEW DAYS. When the duke of Burgundy had remained for about eight days in Noyon, he departed, to lay siege to the castle of Choisy sur Oise, in which was Louis de Flavy, holding it for sir William de Flavy. The duke's engines did so much mischief to the walls of the castle that the garrison capitulated, on being allowed to march away with their baggage in safety. So soon as they had quitted the castle, it was demolished and razed to the ground. The duke built a bridge over the Oise, to enable himself and his army to cross toward Compiègne on the side of Mondidier. During this time, the lord de Saveuses and John de Brimeu had been appointed to guard the suburbs of Noyon, with their men, and those of the lord Montgomery and of other English captains quartered at Pont l'Evêque, to prevent the garrison of Compiègne from cutting of the supplies from the duke's army.