Fuentes de Oñoro
Soon after the Battle of Fuentes de Oñoro, the French army withdrew from the northern frontier of Portugal, and the Duke of Wellington, with three divisions of the British Army and a corps of cavalry, blockaded Ciudad Rodrigo. In September 1811, Marshal Marmont assembled the army of the north, consisting of 60,000 infantry and 5,000 cavalry, in the neighbourhood of Salamanca, and moved on Ciudad Rodrigo, for the purpose of raising the blockade.