Although Cádiz was besieged by the French from February 1810 to August 1812, support from the Royal Navy allowed the Council to send small amphibious expeditions intended to bolster resistance elsewhere. De Lacy led landings in Algeciras, Ronda, Marbella and Huelva and although unable to hold them, this absorbed French resources. In March 1811, de Lacy's troops supported an Anglo-Spanish attempt to break the siege of Cádiz; the resulting Battle of Barrosa was a significant victory, although command failures meant the siege continued.
