War having been declared against Spain, in the autumn of 1739, the regiment was withdrawn from Ireland, and landing at Liverpool, was stationed in South Britain during the year 1740; in the summer of 1741 it was encamped on Lexden Heath, where seven regiments of cavalry and seven of infantry were assembled, and held in readiness for foreign service.
1742
In the summer of 1742 King George II. sent sixteen thousand men to Flanders, to support the interest of the House of Austria against the aggressions of France and Bavaria: the ROYAL NORTH BRITISH FUSILIERS formed part of this force, and were stationed some time at Ghent.
1743
Early in 1743 the regiment commenced its march for Germany, and after taking part in several movements in the field, had the honor to distinguish itself, under the eye of its Sovereign, at the battle of Dettingen, on the 27th of June, when the French troops, under Marshal Noailles, were driven from the field of battle with great slaughter, and the loss of a number of standards and colours.
The ROYAL NORTH BRITISH FUSILIERS had Lieutenant Yonge, one serjeant, and thirty-five rank and file killed; Lieutenant Levingstone, one serjeant, two drummers, and fifty-three rank and file wounded.
The regiment was afterwards encamped near Hanau; in August it crossed the Rhine, and was employed in West Germany; but in the autumn it returned to Flanders.
1744
During the campaign of 1744 the regiment served with the army under Field-Marshal Wade; it was encamped between Asche and Alost, afterwards on the banks of the Scheldt, and subsequently penetrated the French territory to the vicinity of Lisle; but returned to Ghent for winter-quarters.