The approach of the army towards the Maese alarmed the French, and they raised the siege of the citadel of Liege and retired. On the 4th of July the first battalion of the ROYAL Regiment was detached, with other forces under General Schultz and Lieut.-General the Earl of Orkney, to besiege _Huy_, which had been captured by the French during the absence of the army up the Moselle. On the 6th a battery of twelve cannon and six mortars opened a sharp fire upon Fort Picard; and during the afternoon of the same day the troops forced the covered-way and reared their ladders against the walls, when the French quitted this fort and also Fort Rouge, and fled to the castle. On the 10th the batteries were brought to bear on the castle and on Fort Joseph, and on the following day the garrison surrendered. Meanwhile the French army, commanded by Marshal Villeroy and the Elector of Bavaria, having taken refuge behind their fortified lines, the Duke of Marlborough had formed a scheme for forcing these stupendous barriers, and the first battalion of the ROYAL Regiment rejoined the army in time to take part in this splendid enterprise. The lines were menaced by a detachment on the south of the Mehaine, which drew the greater part of the French army to that quarter; and during the night of the 17th of July the allied army marched to its right, and at four o'clock on the following morning the leading regiments approached the works at _Neer-Hespen_ and _Helixem_. Both battalions of the ROYAL Regiment were in the leading division. Their advance was concealed by a thick fog, and under the cover of this obscurity one column cleared the village of Neer-Winden and Neer-Hespen, another gained the bridge and village of Helixem, and a third carried the castle of Wange, which commanded the passage over the Little Gheet. Then rushing through the inclosures and marshy grounds, the troops forded the river, and crowded over the defences with an ardour which overcame all opposition. The French guards were surprised and overpowered, and a detachment of dragoons fled in a panic. Thus the lines were forced; the pioneers were instantly set to work, and in a short time a passage was made for the cavalry. While this was in progress, the Marquis d'Allegre advanced with twenty battalions of infantry, and fifty squadrons of cavalry, and opened a sharp cannonade; but his advance was retarded by a hollow way, which gave time for more troops to pass the lines; and eventually his forces were attacked and defeated, and the allies took many prisoners, and also captured a number of standards and colours. Speaking of this action, the Duke of Marlborough observes in a letter published in his memoirs,--"It is impossible to say too much good of the troops that were with me, for never men fought better."