Abundance of horses being found in the country, the regiment was mounted; but great difficulty was experienced in procuring forage. Lieut.-Colonel Lloyd proceeded above twenty miles up the country, with four troops of the SEVENTEENTH, and two squadrons of the Twentieth and Twenty-first Light Dragoons, and occupied the out-posts of Canelon and St. Joseph, the latter situate on the bank of a river of the same name. In the early part of March Captain Ross's troop was sent to Las Penais, and Captain Supple's to Cosa Negro barracks; and on the 1st of May the regiment had two hundred and twenty-four mounted and three hundred and seventy-one dismounted men in cantonments in and about Monte Video. The arrival of Lieut.-General Whitelocke with additional troops, and afterwards of Brigadier-General Craufurd with a further reinforcement, was followed by an attack on the city of _Buenos Ayres_. Embarking from Monte Video, the troops sailed nearly a hundred miles further up the river, and then landed on the right bank, about thirty miles from the city. Four dismounted troops of the SEVENTEENTH were left, with a regiment of foot, to escort the artillery from the place of disembarkation; and the four mounted troops, mustering forty men each, under Lieut.-Colonel Evan Lloyd, were employed as follows:--Two troops were ordered to give up their horses to the commissariat, but on putting on the pack-saddles the horses broke loose, and were of little use: thirty mounted men remained under Captain Lloyd, to superintend the landing of provision,--of these, ten were sent forward after the army with despatches, twelve mounted men were attached to one of the infantry brigades, and the remainder accompanied Lieut.-General Whitelocke. Thus this small mounted cavalry force was so employed, that it was not available for the more important services of the expedition.