The immense preparations of the enemy for the ensuing campaign induced Lord Wellington[40] to limit his operations in 1810 to the defence of Portugal. The second battalion of the FIFTH formed part of Major-General Lightburn's brigade of the third (Sir Thomas Picton's) division of the army, and was stationed for some time behind the Mondego river, from whence it advanced to Pinhel behind the Coa to support the light division; and was afterwards employed in a series of operations to retard the advance of the overpowering numbers of the enemy. At length Lord Wellington made a stand on the rocks of _Busaco_; and the third division had its post on the heights near the village of St. Antonio de Cantara. Here the second battalion of the FIFTH was first under fire, and its light company, under Lieutenant Shadwell Clerke, was thrown out to repulse the advancing skirmishers of the enemy, a service which it most promptly and gallantly performed. The French, after astonishing efforts, gave way before the superior valour and tactics of the British troops. For this victory, Lieutenant-Colonel the Honourable Henry King, commanding the battalion, received a medal, and the word "BUSACO" was authorized, on the 31st of December, 1825, to be inscribed upon the colours of the regiment. Its loss in the battle of Busaco was one killed and seven wounded. After the battle, the French having made a flank movement, Lord Wellington retired to the celebrated lines of _Torres Vedras_, where he posed an insurmountable barrier to the further progress of the enemy; and the second battalion of the FIFTH passed the remainder of the year in these stupendous works. The first battalion remaining on home service was removed, in March, 1810, from Bexhill to Lewes, and on the 12th of August was, with several other corps, reviewed on Brighton Downs by his Royal Highness the Prince Regent, attended by his Royal Highness the Duke of Clarence, (afterwards King William IV.,) who expressed themselves in terms of approbation of its appearance and discipline. Two days afterwards the battalion marched to Portsmouth, where it embarked for Ireland, and on its arrival was quartered at Fermoy. [Sidenote: 1811]