In December 1779, a large convoy sailed from England to Gibraltar, escorted by 21 ships of the line under the command of Admiral George Rodney. On their way, they encountered and captured a Spanish convoy off Cape Finisterre on 8 January 1780. They planned to provision the Gibraltar garrison further with the goods they had captured. The Spanish soon learned of the convoy and sent a fleet under Juan de Langara to intercept it, but underestimated the escort's strength, and Langara's ships soon had to flee. Rodney caught up with and defeated the Spanish fleet at the Battle of Cape St. Vincent, taking five ships of the line and additional supplies. The fleet easily penetrated the Spanish blockade and reached Gibraltar on 25 January 1780, bringing reinforcements of 1,052 men of the 73rd Highland regiment of foot under George Mackenzie and an abundance of supplies, including the captured Spanish goods. This greatly heartened the garrison, but as soon as Rodney's fleet left, the siege resumed.