In the mean time, the allied army, commanded by the great Duke of Marlborough and Prince Eugene of Savoy, was carrying on the siege of the celebrated city of Lisle, the capital of French Flanders, which was defended by fifteen thousand men, under Marshal Boufflers. The French and Spaniards, thinking to prevent the allied army receiving supplies from the coast, detached a body of troops, under General Count de la Motte, towards Ostend; and the troops employed in alarming the French coast, were suddenly ordered to proceed to that port, where they arrived on the 21st of September. The TWELFTH, and other regiments of the expedition, having landed at Ostend, the French general retired; first cutting the dykes, to lay the country between Ostend and Nieuport under water, and to prevent the troops, under Major-General Erle, communicating with the grand army under the Duke of Marlborough. A strong detachment from the TWELFTH, and two other regiments, seized on Leffinghen, constructed some works, and established a post at that village. At this period, the army before Lisle was deficient in ammunition for carrying on the siege, and the Duke of Marlborough, having heard of the arrival of the troops at Ostend, and of their having established a post at Leffinghen, sent seven hundred waggons thither, under a strong guard, for supplies. The soldiers of the TWELFTH, and other corps at Ostend, were employed in draining the inundations; they built a bridge over the canal of Leffinghen, opened a communication with the grand army, and assisted in loading the seven hundred waggons with ammunition and other necessaries. The waggons left Ostend on the 27th of September; the troops employed to guard the convoy, under Major-General Webb, were attacked on the following day in the wood of Wynendale, by twenty-two thousand French and Spaniards, under Count de la Motte, who was repulsed, and the convoy arrived in safety at the head-quarters of the army. Major-General Webb received the thanks of Parliament for his conduct on this occasion.