In the spring of 1712 the FIFTEENTH regiment took the field with the army under the Duke of Ormond, who had been appointed to the command in succession to the Duke of Marlborough, and advanced to the frontiers of France. Negociations for peace having commenced, a suspension of hostilities took place between the British and French, and the regiment returned to Ghent; from whence it was afterwards removed to Dunkirk, the French monarch having agreed to deliver up that fortress until the treaty of peace was concluded.
The regiment was stationed at Dunkirk in 1713, and at Nieuport in the early part of 1714.
While the regiment was in Flanders, the decease of Queen Anne, and the accession of King George I., occurred, on the 1st of August, 1714, and soon afterwards the FIFTEENTH foot, and several other corps, were ordered to return to England.
On the 8th of February, 1715, the Earl of Hertford was promoted to the colonelcy of the second troop (now second regiment) of life guards, and was succeeded in the command of the FIFTEENTH foot by Colonel Harry Harrison.
The regiment was actively employed in South Britain during the troubles in 1715; but it was not called upon to take the field against the rebels under the Earl of Mar, who were dispersed, in the beginning of 1716, by the King's troops under the Duke of Argyle.
In 1719, the regiment was stationed in Scotland, when the King of Spain fitted out an armament for the invasion of Great Britain in favour of the Pretender. The Spanish fleet was dispersed by a storm; two ships, however, arrived on the coast of Scotland, and four hundred Spaniards and about a hundred Scots and English gentlemen, landed on the 27th of April, at Kintail, and were afterwards joined by about fifteen hundred Highlanders. Against this force, three troops of the Greys, and the eleventh, fourteenth, and FIFTEENTH regiments of foot, marched from Inverness on the 5th of June, under Major-General Wightman, and encountered the rebels on the 10th of that month, at the pass of _Glenshiel_; when the Spaniards and Highlanders withdrew a short distance, and formed for battle on the romantic mountain scenery in the pass of Strachell. About five o'clock in the afternoon, the grenadiers of the three regiments climbed the rocky crags, and commenced the action; they were followed by the eleventh, and a detachment of the FIFTEENTH under Colonel Harrison; at the same time, the Greys galloped forward along the road; and the Spaniards and Highlanders were forced from the lofty ground on which they had taken post. The rebels made a second stand on the top of the hill, but were speedily driven from thence. The Highlanders afterwards dispersed to their homes, and on the following day, the Spaniards surrendered prisoners of war.