In the summer of 1709, when the siege of the strong fortress of _Tournay_ was resolved upon, this was one of the regiments which first invested the town on the 27th of June, 1709. After the capture of this place, the army advanced towards Mons, the capital of the province of Hainault, with the design of capturing that important city. The French army, commanded by Marshals Villiers and Boufflers, manœuvred to prevent the loss of Mons, and this brought on the sanguinary battle of _Malplaquet_, where the British regiments of horse encountered enemies who fought with greater spirit and obstinacy than on any former occasion during this war. This battle was fought on the 11th of September, 1709. The enemy had an advantageous position, covered by thick woods, protected by barriers of trees cut down and laid across each other, with a treble entrenchment, batteries, and pallisades; and within these formidable works were collected the choicest troops of France under commanders of renown. This post was attacked with a bravery which overcame all opposition; the woods were pierced, the obstacles were overcome, and the fortifications were trampled down. The position having been forced, the Duke of Marlborough led the British CUIRASSIERS and Prussian cavalry against the French gens d'armes, who were routed and chased from the ground; but scarcely were these squadrons overcome, when the British and Prussian horse encountered a compact line of French cavalry of the royal household, and were driven back in some disorder. The British horse soon rallied, and returning to the charge, overcame their celebrated adversaries, and the French squadrons were driven from the field. The allies were victorious, but they sustained a severe loss in killed and wounded. CADOGAN'S HORSE were afterwards employed in covering the siege of _Mons_, which was terminated by the surrender of the place on the 20th of October. [Sidenote: 1710] During the campaign of 1710, the regiment was employed in covering the sieges of _Douay_, _Bethune_, _Aire_, and _St. Venant_, and in protecting convoys of military stores to the besieging troops. [Sidenote: 1711]