In February, Lord Wellington having resolved on the siege of Badajoz, the capital of Spanish Estremadura, the KING'S OWN marched south with their brigade (the fifth dragoon guards, and fourth dragoons,) and arrived at Borba in the Alemtejo on the 5th of March. On the 16th, a pontoon bridge was thrown over the Guadiana, and Badajoz was invested; the day previous to which the brigade moved from Borba, and crossing the bridge, formed the advance guard of the covering army, which continued to advance till it arrived at the foot of an extensive chain of mountains called the Sierra Morena. On the 26th, the KING'S OWN marched at sunset from Medina to Campo, and at midnight joined a force under Lieut.-General Sir Thomas Graham, destined to surprise three battalions of French infantry and two regiments of cavalry lying in Llerena. Owing to a mistake on the part of the Chasseurs Britanniques (who formed the advance of the infantry column), the projected surprise failed, and the French retired into the mountains during the night, and took post at Azuaga, a town nine miles to the south of Llerena. On the 29th of March, after a sharp affair, the French were driven from Azuaga, and the head quarters of the BRIGADE were established there. The authorities of this town gave a superb entertainment to Sir Stapleton Cotton. On the night of the 31st of March, a man deserted, who, it is supposed, gave information of the situation and strength of the British outpost; and on the 1st of April, a strong French force was detached to cut off the piquets at La Granja. A patrol, commanded by Cornet Ratcliffe of the THIRD, having met with the enemy's advance guard, was driven in, and the two British squadrons were attacked by seven squadrons of French cavalry, supported by infantry. After a severe struggle, the enemy, perceiving their surprise had failed, retired, and the piquets resumed their station.[33] In this affair the KING'S OWN lost thirteen men and twelve horses.