The Twelfth were stationed near Kirch Denkern until the 27th of July: they were subsequently employed in manœuvring and skirmishing in various parts of the bishopric of Paderborn and on the river Weser, and in September they were employed in the country of Hesse. They were engaged in several skirmishes in the electorate of Hanover in the early part of November; and were subsequently quartered for several months in the bishopric of Osnaburg.
1762
The regiment left its cantonments in Osnaburg in the spring of 1762, and was formed in brigade with the same regiments as in the preceding year. It was engaged, on the 24th of June, in the surprise of the French army encamped at Groebenstein: on the morning of that day it was in motion at an early hour, crossed the river Dymel at Liebenau at four o'clock, and advancing several miles through a woody country, arrived in front of the enemy's camp. The French were surprised and confounded; they abandoned their camp, leaving their tents standing, and retreated towards Cassel; one division, under General Stainville, throwing itself into the woods of Wilhelmsthal, to cover the movement. This division was attacked, and nearly annihilated; and after the loss of many men killed and wounded, the remainder surrendered to the fifth foot, which was the leading regiment of the brigade to which the Twelfth belonged.
After the action, the regiment encamped on the heights of Wilhelmsthal; it was subsequently employed in various operations; and on the 23rd of July its grenadier company took part in driving the Saxons, under Prince Xavier, from their post at Lutterberg, and in the capture of thirteen pieces of cannon.
On the 24th of July a hundred men of the Twelfth foot were engaged in dislodging a detachment of the enemy from the heights of Homburg. The regiment was afterwards employed in operations on the rivers Ohm and Lahn, and in covering the siege of Cassel, which fortress surrendered in the beginning of November.
A suspension of hostilities took place soon after the surrender of Cassel, which was followed by a treaty of peace, concluded at Fontainbleau: the regiment was quartered in the bishopric of Munster about ten weeks.
1763
In the beginning of 1763, the thanks of Parliament were communicated to the army for its conduct during the war. In February, the regiment marched through Holland to Williamstadt, where it embarked for England: its effective strength, according to the embarkation return, was twenty-seven officers, six hundred and eighty-nine non-commissioned officers and soldiers.
1764
1765
1766
On arriving in England, from Germany, the Twelfth were ordered to proceed to Scotland, where they were stationed during the following three years.