The conferences did not retard the operation of the campaign. Prince Eugene and the duke of Marlborough set out from the Hague on the fifteenth day of March for Tournay, in order to assemble the forces which were quartered on the Maese, in Flanders, and Brabant. On the twentieth of April, they suddenly advanced to Pont-a-Vendin, in order to attack the lines upon which the French had been at work all the winter, hoping by these to cover Douay and other frontier towns, which were threatened by the confederates. The troops left for the defence of the lines retired without opposition. The allies having laid bridges over the scarp, the duke of Marlborough with his division passed the river and encamped at Vitri. Prince Eugene remained on the other side and invested Douay, the enemy retiring towards Cambray. Mareschal Villars still commanded the French army, which was extremely numerous and well appointed, considering the distress of that kingdom. Indeed, the number was augmented by that distress; for many thousands saved themselves from dying of hunger, by carrying arms in the service. The mareschal having assembled all his forces, passed the Schelde, and encamped at Boucham, declaring that he would give battle to the confederates: an alteration was immediately made in the disposition of the allies, and proper precautions taken for his reception. He advanced in order of battle; but having viewed the situation of the confederates, he marched back to the heights of St. Lawrence, where he fixed his camp. His aim was, by continual alarms, to interrupt the siege of Douay, which was vigorously defended by a numerous garrison, under the command of monsieur Albergotti, who made a number of successful sallies, in which the besiegers lost a great number of men. They were likewise repulsed in several assaults; but still proceeded with unremitted vigour until the besieged, being reduced to the last extremity, were obliged to capitulate on the twenty-sixth of June, fifty days after the trenches had been opened. The generals finding it impracticable to attack the enemy, who were posted within strong lines from Arras towards Miramont, resolved to besiege Bethune, which was invested on the fifteenth day of July, and surrendered on the twenty-ninth of August. Villars marched out of his intrenchments with a view to raise the siege; but he did not think proper to hazard an engagement: some warm skirmishes, however, happened between the foragers of the two armies. After the reduction of Bethune, the allies besieged at one time the towns of Aire and St. Venant, which were taken without much difficulty. Then the armies broke up, and marched into winter quarters.