The regiment left its quarters in Portalegre on the 21st of July, and was hutted near that town seven days, when it proceeded into cantonments at Castel de Vide. When Lord Wellington moved towards the Agueda with the view of rescuing Ciudad Rodrigo from the power of the enemy, the FOURTH crossed the Tagus by the bridge of boats, and proceeding by Castello Branco, entered Spain on the 11th of August at Navas Frias. After passing seven days in huts near St. Payo, they proceeded into cantonments at Pena Parda; but returned to their huts on the 26th of August, and back to quarters on the 2d of September, where they remained until the 26th of that month: meanwhile Ciudad Rodrigo was blockaded, and Lord Wellington's head-quarters were at Fuentes Guinaldo. When Marshal Marmont advanced to relieve this fortress, the FOURTH remained with their division at St. Payo, watching the passes from Estremadura. In the subsequent manœuvres they were not brought into action with the enemy; and after the retreat of the French army, they were stationed at Guarda, in Portugal. [Sidenote: 1812] The enemy being deceived by the seemingly careless winter attitude of the allied army, left _Ciudad Rodrigo_ to the protection of its garrison; and the British commander, profiting by this omission, commenced the siege of this important fortress in the early part of January, 1812 with four divisions; the KING'S OWN remained in quarters at Bobadela, where they had proceeded on the 7th of December. On the receipt of intelligence that Marshal Marmont was collecting his forces to succour the place, the whole army was brought forward and posted in the villages on the Coa, ready to cross the Agueda and give battle. Ciudad Rodrigo was captured by storm during the night of the 19th of January; and the FOURTH were cantoned in the suburbs of that fortress from the 20th of January to the 23d of February. In consequence of the great difficulty experienced in procuring land carriage for the supplies of the army, many of the regiments had to proceed a considerable distance for their clothing, and the KING'S OWN marched for that purpose from Ciudad Rodrigo to Penacova, where the clothing arrived by water from Coimbra; that in use having been in wear during two years of hard service. Meanwhile the fifth division was proceeding towards the Alentejo to engage in the siege of _Badajoz_, and the regiment joined its brigade at Campo Mayor on the 24th of March. On the 30th of that month it proceeded to Elvas; on the 4th of April it bivouacked near the city of Badajoz, and three breaches, which were deemed practicable, having been made, the regiment was formed on the evening of the 6th ready to take part in the storming of this strong fortress. On this occasion the fifth division was directed to make a false attack on the Pardaleras, and a real assault on the bastion of San Vincente; the KING'S OWN, headed by Lieut.-Colonel Brooke, led the assault of the bastion.