Great Siege of Gibraltar


The Great Siege of Gibraltar was an unsuccessful attempt by Spain and France to capture Gibraltar from the British during the American Revolutionary War. It was the largest battle in the war by number of combatants.
On 16 June 1779, Spain entered the war on the side of France and as co-belligerents of the revolutionary United States—the British base at Gibraltar was Spain's primary war aim. The vulnerable Gibraltar garrison under George Augustus Eliott was blockaded from June 1779 to February 1783, initially by the Spanish alone, led by Martín Álvarez de Sotomayor. The blockade proved to be a failure because two relief convoys entered unmolested—the first under Admiral George Rodney in 1780 and the second under Admiral George Darby in 1781—despite the presence of the Spanish fleets. The same year, a major assault was planned by the Spanish, but the Gibraltar garrison sortied in November and destroyed many of the forward batteries.
After the Spanish consistently failed to either defeat the garrison or prevent the arrival of relief efforts, the besiegers were reinforced by French forces under de Crillon, who took over command in early 1782. After a lull in the siege, during which the Franco-Spanish besiegers gathered more guns, ships, and troops, a "Grand Assault" was launched on 13 September 1782. This involved huge numbers—60,000 men, 49 ships of the line and 10 specially designed, newly invented floating batteries—against the 5,000 defenders. The assault proved to be a disastrous and humiliating failure, resulting in heavy losses for the attackers. This was the largest action fought during the war in terms of numbers.
The final sign of defeat for the besiegers came when a crucial British relief convoy under Admiral Richard Howe slipped through the blockading fleet and arrived at the garrison in October 1782. The siege was finally lifted on 7 February 1783 and resulted in a decisive victory for the British. The siege was a factor in ending the American Revolutionary War—the Peace of Paris negotiations were reliant on news from the siege, particularly at its climax. At three years, seven months and twelve days, it is the longest siege endured by the British Armed Forces.

Background

The Rock of Gibraltar was first fortified with the Moorish Castle in 710 AD. It was the site of ten sieges during the Middle Ages, some of them successful. An Anglo-Dutch force captured the Gibraltar peninsula in 1704 during the War of the Spanish Succession; possession was assigned to Britain in the 1713 peace Treaty of Utrecht that ended the war. The Spanish made an unsuccessful attempt to recapture Gibraltar in 1727 during the Anglo-Spanish War. After the war ended with the Treaty of Seville, in 1730 Spain built a line of fortifications across the north of the peninsula, cutting Gibraltar off from the mainland.
In 1738 a dispute between Spain and Great Britain arose over commerce between Europe and the Americas. This led to the outbreak of the War of Jenkins' Ear on 23 October 1739. Both sides planned to establish trenches near Gibraltar. Seeing these first movements, Britain ordered Admiral Vernon to sail from Portobello and strengthen the squadron of Admiral Haddock who was already stationed in the Bay of Gibraltar. However, no substantial fighting occurred at Gibraltar before peace returned in 1748.
King Philip V of Spain had died on 9 July 1746 and his successor, Ferdinand VI, began negotiations with Britain on trade. The British Parliament was amenable: they considered lifting the British embargo on Spain and possibly ceding Gibraltar in return for a trade agreement. However, none was reached before Ferdinand VI died in 1759. The new king, Charles III, was less willing to negotiate with Britain. Instead, he signed a Family Compact alliance with Louis XV of France on 15 August 1761. France was already at war with Britain in the Seven Years' War, so Britain responded by declaring war on Spain. In the following two years, the British captured Manila and Havana, the capitals of the Spanish colonies of the Philippines and Cuba, respectively. Again there was no fighting at Gibraltar. The peace Treaty of Paris that ended the war returned Manila and Havana to Spain, in exchange for Spanish holdings in Florida. The treaty also transferred most of France's colonies in North America to Britain.
In the years of peace that followed both France and Spain sought an opportunity to fight Britain on more favourable terms, with the goal of recovering their lost colonial possessions. The outbreak of the American War of Independence in 1775 provided that opportunity.
Both France and Spain began by supplying funding and arms to the American revolutionaries, and drew up a strategy to intervene on the American side against Britain. France entered the war as allies of the new United States with a Treaty of Alliance in October 1778. On 12 April 1779 France signed the Treaty of Aranjuez with Spain based on its Third Pacte de Famille between the Bourbon kings, wherein they agreed to aid one another in recovering lost territory from Britain. Spain then declared war on Britain on 16 June and became a formal co-belligerent with the United States Congress. The first war aim for Spain at Aranjuez was to secure Gibraltar, and the agreement with France was not to make peace or agree to a truce until that place was recovered. With the British occupied with the war in America, their base at Gibraltar was vulnerable, and Spain expected its capture to be a straightforward opening to the war, to be followed by a Franco-Spanish invasion of Great Britain that could be used as a bargaining chip in negotiations to recover the lost colonies.

Opposing forces

The Spanish blockade was to be directed by Martín Álvarez de Sotomayor. Spanish ground forces were composed of 16 infantry battalions, which included the Royal Guards and the Walloon Guards, along with artillery and 12 squadrons of cavalry. This yielded a total of about 14,000 men. The artillery was commanded by Rudesindo Tilly, while the cavalry and the French dragoons were headed by the Marquis of Arellano. Antonio Barceló commanded the maritime forces responsible for blockading the bay. He established his base in Algeciras, with a fleet of several xebecs and gunboats. French involvement was limited, but in 1781 the first of them arrived in numbers with the Régiment de Besançon.
A fleet of 11 ships of the line and two frigates were placed in the Gulf of Cadiz under the command of Luis de Córdova y Córdova to block the passage of British reinforcements.
The British garrison in 1778 consisted of 5,382 soldiers under General Eliott as Governor-General. All the defences were strengthened. The main physical task facing Eliott was an extensive building programme of new fortifications for Gibraltar, as set out in a report by a commission that had examined the state of the Rock's defences in the early 1770s. The most prominent new work was the King's Bastion designed by Sir William Green and built by the Soldier Artificer Company on the main waterfront of the town in Gibraltar. The King's Bastion comprised a stone battery holding 26 heavy guns and mortars, with barracks and casemates to house a full battalion of foot. The Grand Battery protected the Land Port Gate, the main entrance to Gibraltar from the isthmus connecting to the Spanish mainland. Other fortifications and batteries crowded along the town's waterfront and on the Rock.
Eliott began a programme of increasing the number of guns deployed in the batteries and fortifications, which initially stood at 412, many of them inoperable. Many of the infantry assisted the artillery in serving the guns. The garrison included three battalions of Hanoverian and around 80 Corsican troops. Eliott also formed a unit of sharpshooters. The Royal Navy had only a token force present—mostly sailors and marines on shore—but one former ship of the line, HMS Panther, was moored in the harbour as a hulk and floating battery. The frigate HMS Enterprise and twelve gunboats were also present. Eliott's preparations inspired confidence in his troops. The British had anticipated an attack for some time, and had received additional reinforcements and supplies by ship. Britain stepped up preparations after France entered the conflict in 1778, although the French were initially more concerned with sending forces to America, and it was not until Spain joined the war that the long-expected siege commenced.
British troops included:
On 16 June 1779, the Spanish issued what was in effect a declaration of war against Great Britain, and a blockade immediately commenced. On 6 July 1779, an engagement took place between the British ships and Spanish vessels bringing supplies to the Spanish troops on shore. Several Spanish vessels were taken and the hostilities began. The combined Spanish and French fleets blockaded Gibraltar from the sea, while on the land side an enormous army constructed forts, redoubts, entrenchments, and batteries from which to attack.
As the winter of 1779 came, provisions for the garrison soon became scarce. Bread was almost impossible to obtain and was not permitted to be issued except to the sick and to children. Salt meat and biscuits soon became a major part of the rations, with an occasional issue of four ounces of rice each day. Fuel was exhausted, and fires were made only with difficulty, using the salt-encrusted timbers of old ships broken up in the harbour for the purpose. As a result, a violent outbreak of scurvy occurred among the troops, owing to the lack of vegetables and medicines. Eliott appealed to London for relief, but as the winter wore on, rations were reduced further. Despite this, the garrison's morale remained high, and the troops continued to take their turns at various posts of duty. They had also repulsed several small testing assaults made by the Spanish and had great faith that they would receive supplies by sea, thus enduring the cold and hunger.
The Spanish were forced to commit a greater number of troops and ships to the siege, postponing the planned invasion of England, owing to this and the cancellation of the Armada of 1779.