In the spring of 1752 the Third Dragoon Guards furnished a relay of escorts to attend the King to Harwich, where His Majesty embarked for the continent, on a visit to his German dominions. During the remainder of that year, and in the two succeeding years, detachments of the regiment were employed on coast duty in Suffolk, Essex, and Devonshire. Owing to an increase of duty on several articles of foreign produce, smuggling had become prevalent to a great extent in England, and it was found necessary to have parties of dragoons constantly stationed in the maritime towns and villages to assist the officers of the revenue in preventing the introduction of contraband goods. At the same time a laxity of morals prevailed amongst the labouring classes; and, in the absence of an efficient police in the kingdom, parties of dragoons were employed to patrole the public roads for the prevention of highway robberies, which had become alarmingly frequent, and were often attended with acts of cruelty and even murder. From the ephemeral publications of the day it appears that organized gangs of robbers infested many parts of the kingdom at this period.
1755
In 1755 signs of an approaching war began to appear. The French committed several acts of violence against British settlements in America; retaliation was made by the English troops, and the French were driven from the possessions they had seized. The British Court was disposed to an amicable arrangement of the existing differences; but such difficulties were raised by France, that his Majesty deemed it prudent to augment the strength of the regular army, and an addition of 1 corporal and 15 men was made to the strength of each troop of the Third Dragoon Guards: and subsequently a LIGHT TROOP, consisting of 3 officers, 1 quarter-master, 2 serjeants, 3 corporals, 2 drummers, and 60 private men, was added to the establishment.[45] The general utility of light dragoons had been manifest in continental warfare; a regiment of light horse raised by the Duke of Kingston in 1744 had been highly instrumental in the suppression of the rebellion in Scotland; and from the autumn of 1755 light cavalry have constituted a portion of the British land forces.
1756
The aggressions of France in America were followed by a declaration of war; when the King of France made preparations for a descent upon England, which produced considerable alarm in the kingdom; but the designs of the enemy were frustrated by the warlike preparations of the British Government. In this year (1756) the establishment of the Third Dragoon Guards was 24 officers, 7 quarter-masters, and 427 non-commissioned officers and private men.
During the summer a detachment of the regiment was stationed at Kensington to assist the Life Guards in the performance of the travelling escort-duty for the royal family.
1757
In July, 1757, the regiment was encamped, with several other corps, on Salisbury Plain, under the command of Lieut.-General Hawley; and a brigade was there formed of the LIGHT TROOPS of several regiments, for instruction in the evolutions, and in services peculiar to light cavalry. In autumn the regiment marched to quarters at Colchester, Malden, and Witham.
1758
The augmentation made in the naval and military establishments of the kingdom enabled the British Government to act offensively, and in the spring of 1758 the LIGHT TROOP of the Third Dragoon Guards was called upon to hold itself in readiness for actual warfare. In April it was ordered to encamp near Petersfield, where a brigade was formed of the light troops of nine regiments, under the command of Colonel Eliott, of the Horse Grenadier Guards. Towards the end of May the brigade embarked on board transports,—forming part of an expedition under Charles Duke of Marlborough, designed for a descent on the coast of France. On the 5th of June the Fleet arrived in Cancalle Bay, on the coast of Brittany, and, having silenced a battery on the shore, part of the troops were immediately landed; when a battalion of French infantry and two troops of cavalry, posted on the heights near that place, retired without making opposition. On the following day the brigade of light cavalry and the artillery were landed; and on the 7th the whole (excepting three battalions of infantry left to cover the coast) marched to the vicinity of St. Maloes, and during the night the light cavalry, with detachments from the infantry, set fire to the shipping and naval stores at St. Servan, destroyed a fleet of privateers, with a man-of-war of fifty guns, and another of thirty-six, and afterwards retired. The capture of St. Maloes had been designed; but the expedition was not provided with troops and heavy ordnance sufficient for so great an undertaking; consequently that design was laid aside, and on the 11th of June the light cavalry were re-embarked. A second descent being rendered impracticable by severe weather, the fleet returned to England, and the light cavalry landed and encamped near Portsmouth and subsequently on Southsea Common.