The regiment, having been selected to form part of the army of occupation, was placed in brigade with the Eighteenth Hussars under Major-General Sir Hussey Vivian, and while stationed at Fruges, it assembled on the memorable field of Agincourt, where the Waterloo medals were presented to the officers and soldiers. In May, 1816, the regiment marched to Desvres, (Pas-de-Calais,) where the depôt squadron joined from England, and information was received, that His Royal Highness the Prince Regent had approved of the regiment being armed and equipped as a corps of "LANCERS;" a detachment was, consequently, sent to England to learn the use of the LANCE. In October the regiment was reviewed, with the British, Saxon, and Danish contingents of the army of occupation, by their Royal Highnesses the Dukes of Kent and Cambridge. [Sidenote: 1817] As a further reward for its conduct on all occasions, the royal authority was granted, in March, 1817, for the regiment being styled the "TWELFTH, OR PRINCE OF WALES'S, ROYAL LANCERS." At the same time the color of the facings was changed from yellow to scarlet, and the lace from silver to gold. [Sidenote: 1818] In the autumn of this year the regiment was reviewed, with the army of occupation, near Valenciennes, by the King of Prussia and several princes and nobles; and in the autumn of 1818 the Russian, British, Danish, Saxon, and Hanoverian contingents, were reviewed by the Emperor of Russia, King of Prussia, Prince of Orange, and the Grand Dukes Constantine and Michael. After this review, the army of occupation was withdrawn from France; the TWELFTH Royal Lancers embarked at Calais on the 10th of November, landed at Dover on the following day, and proceeded from thence to Chichester and Arundel. At the end of November they marched to Staines, and were on duty at the funeral of Her Majesty Queen Charlotte. They subsequently proceeded to Canterbury, and furnished detachments to Hythe and Deal. [Sidenote: 1819] On the 21st January, 1819, Captain Alexander Barton was promoted, with other officers, to the rank of major in the army, for distinguished conduct in the field, while on service in the Peninsula, upon the recommendation of Field-Marshal the Duke of Wellington. [Sidenote: 1820] In the summer of 1819, the regiment was removed to Hounslow and Hampton-court, and was reviewed by His Royal Highness the Prince Regent. In August, 1820, it embarked at Bristol for Ireland, and after landing at Waterford, the head-quarters were stationed at Cahir. Colonel the Honorable F. C. Ponsonby exchanged to the half-pay, and was succeeded by Lieut.-Colonel T. W. Brotherton, who had served with distinguished gallantry in the Fourteenth Light Dragoons during the Peninsular war, and who assumed the command of the regiment in October of this year. [Sidenote: 1821]