The establishment having been augmented, the regiment was joined in the spring of 1745, by a number of men and horses from England. Soon afterwards it took the field, and advanced with the troops commanded by His Royal Highness the Duke of Cumberland, to the relief of _Tournay_, which fortress was besieged by an immense French army. On the 10th of May, two troops of the QUEEN'S OWN dragoons were employed in driving back the enemy's out-guards and piquets; and on the following day, they were engaged in supporting the attack of the infantry on the formidable position, occupied by the French, near the village of _Fontenoy_. The centre of the position was twice forced by the British regiments; but the Dutch having failed in their point of attack, a retreat was ordered. Towards the close of the action, several squadrons of cavalry charged with signal intrepidity, but were unable to retrieve the fortune of the day, and the army withdrew to Aeth. The regiment lost, on this occasion, ten men, and forty-six horses killed; Lieut.-Colonel Erskine, Captain-Lieutenant Ogilvy, Lieutenant Forbes, Cornet Maitland, Quartermaster Smith, thirty-five men, and forty-seven horses wounded; one man and two horses missing. After the capture of Tournay, the French army advanced with such overwhelming numbers, that the allies were unable to prevent the loss of several important towns. The QUEEN'S OWN dragoons were employed in defensive operations, and were encamped a short time before Brussels. [Sidenote: 1746] Meanwhile, a rebellion had broken out in Scotland, and Charles Edward, eldest son of the Pretender, was at the head of the insurgent clans. Several corps were ordered to return to England; and in February, 1746, the QUEEN'S OWN dragoons proceeded to Williamstadt and embarked; but some delay was occasioned by severe weather, and one transport was stranded. The regiment disembarked to wait for more favourable weather; in the mean time, the prospect of a speedy termination to the rebellion occasioned the order for its return to be countermanded.