Villars having retired without fighting, the operations of the siege were resumed with redoubled vigour. On the 16th June, signals of distress were sent up from the town, which the French marshal perceived, and he made in consequence a show of returning to interrupt the siege, but his movements came to nothing. Marlborough, to counteract his movement, repassed the Scarpe at Vitry, and took up a position directly barring the line of advance of the French marshal, while Eugene prosecuted the siege. Villars again retired without fighting. On the 22d, the Fort of Scarpe was breached, and the sap was advanced to the counterscarp of the fortress, the walls of which were violently shaken; and on the 26th, Albergotti, who had no longer any hope of being relieved, and who saw preparations made for a general assault, capitulated with the garrison, now reduced to four thousand five hundred men.[11] On the surrender of Douay, the Allied generals intended to besiege Arras, the _last_ of the triple line of fortresses which on that side covered France, and between which and Paris no fortified place remained to arrest the march of an invader. On the 10th July, Marlborough crossed the Scarpe at Vitry, and, joining Eugene, their united forces, nearly ninety thousand strong, advanced towards Arras. But Villars, who felt the extreme importance of this last stronghold, had exerted himself to the utmost for its defence. He had long employed his troops on the construction of new lines of great strength on the Crinchon, stretching from Arras and the Somme, and he had here collected nearly a hundred thousand men, and a hundred and thirty pieces of cannon. After reconnoitring this position, the Allied generals concurred in thinking that it was equally impossible to force them, and undertake the siege of Arras, while the enemy, in such strength, and so strongly posted, lay on its flank. Their first intention, on finding themselves baffled in this project, was to seize Hesdin on the Cancher, which would have left the enemy no strong place between them and the coast. But the skilful dispositions of Villars, who on this occasion displayed uncommon abilities and foresight, rendered this design abortive, and it was therefore determined to attack Bethune. This place, which was surrounded with very strong works, was garrisoned by nine thousand men, under the command of M. Puy Vauban, nephew, of the celebrated marshal of the same name. But as an attack on it had not been expected, the necessary supplies for a protracted resistance had not been fully introduced when the investment was completed on the 15th July.[12]