War of Jenkins ' Ear The War of Jenkins ' Ear ( known as " Guerra del Asiento " in Spain ) , was a conflict between Great Britain and Spain that lasted from 1739 to 1748 , with major operations largely ended by 1742 . Its unusual name , coined by Thomas Carlyle in 1858 , refers to an ear severed from Robert Jenkins , captain of a British merchant ship . The severed ear was subsequently exhibited before Parliament . The tale of the ear ' s separation from Jenkins , following the boarding of his vessel by Spanish coast guards in 1731 , provided the impetus to war against the Spanish Empire , ostensibly to encourage the Spanish not to renege on the lucrative " asiento " contract ( permission to sell slaves in Spanish America ) . After 1742 the war was subsumed by the wider War of the Austrian Succession involving most of the powers of Europe . Peace arrived with the Treaty of Aix - la - Chapelle in 1748 . From the English perspective , the war was notable because it was the first time a regiment of colonial American troops were raised and placed " on the Establishment " - made a part of the Regular British Army - and sent to fight outside of North America . Background . At the conclusion of the War of the Spanish Succession , the Treaty of Utrecht in 1713 gave Britain a thirty - year asiento , or contract - right , to supply an unlimited number of slaves to the Spanish colonies , and 500 tons of goods per year . This provided British traders and smugglers potential inroads into the ( traditionally ) closed markets in Spanish America . But Britain and Spain were often at war during this period , fighting one another in the War of the Quadruple Alliance ( 1718 – 20 ) , the Blockade of Porto Bello ( 1726 ) and the Anglo - Spanish War ( 1727 – 1729 ) . In the Treaty of Seville ( 1729 ) , following the Anglo - Spanish War , Britain had accorded Spanish warships the right to stop British traders and verify if the asiento right was respected . Over time the Spanish became suspicious that British traders were abusing the contract and began to board ships and confiscate their cargoes . After very strained relations between 1727 and 1732 , the situation improved between 1732 and 1737 , when Sir Robert Walpole supported Spain during the War of Polish Succession . But the causes of the problems remained and when the opposition against Walpole grew , so did the anti - Spanish sentiment amongst the British public . Walpole gave in to the pressure and approved the sending of troops to the West Indies and a squadron to Gibraltar under Admiral Haddock , causing an immediate Spanish reaction . Spain asked for financial compensation , which led to the British demand to annul the " Visitation Right " agreed to in the Treaty of Seville ( 1729 ) . In reaction , King Philip V of Spain annulled the " Asiento Right " and had all British ships in Spanish harbours confiscated . The Convention of Pardo , an attempt to mediate the dispute , broke down . On 14 August , Britain recalled its ambassador to Spain and officially declared war on 23 October 1739 . Despite the Pacte de Famille , France remained neutral . Walpole was deeply reluctant to declare war and reportedly remarked of the jubilation in Britain " they are ringing their bells , soon they will be wringing their hands " . Nomenclature . The incident that gave its name to the war had occurred in 1731 , off the coast of Florida , when the British brig " Rebecca " was boarded by the Spanish patrol boat " La Isabela " , commanded by Julio León Fandiño . After boarding , Fandiño cut off the left ear of the " Rebecca " < nowiki > ' < / nowiki > s captain , Robert Jenkins , whom he accused of smuggling . Fandiño told Jenkins , " Go , and tell your King that I will do the same , if he dares to do the same . " In March 1738 , Jenkins was ordered to testify before Parliament , presumably to repeat his story before a committee of the House of Commons . According to some accounts , he produced the severed ear as part of his presentation , although no detailed record of the hearing exists . The incident was considered alongside various other cases of " Spanish Depredations upon the British Subjects " , and was perceived as an insult to the honour of the nation and a clear casus belli . The conflict was named by essayist and historian Thomas Carlyle , in 1858 , one hundred and ten years after hostilities ended . Carlyle mentioned the ear in several passages of his " History of Friedrich II " ( 1858 ) , most notably in Book XI , chap VI , where he refers specifically to " the War of Jenkins ' s Ear " . Conduct of the War . First attack on La Guaira ( October 22 , 1739 ) . Following the testimony of Jenkins , and petitions from other West India merchants , the opposition in Parliament voted on 28 March 1738 to send " an Address " to the King , asking his Majesty to seek redress from Spain . More than one year later , all diplomatic means having been exhausted , on 10 July 1739 King George II authorized the Admiralty Board to seek maritime reprisals against Spain . On 20 July , Vice Admiral Edward Vernon and a fleet of warships departed Britain , bound for the West Indies , to attack Spanish ships and " possessions " . The actual declaration of war against Spain was not proclaimed until Saturday 23 October 1739 ( Old Style ) , one day after the attack on La Guaira . After arriving at the island of Antigua in early October 1739 , Vice Admiral Edward Vernon sent three ships under the command of Captain Thomas Waterhouse to intercept Spanish merchant ships that made the route between La Guaira and Portobelo . Waterhouse spotted several small - sized vessels in the port of La Guaira and decided to attack , implementing a rudimentary plan . This was simply to lower the British flag on his ships and fly the Spanish flag . Then , to go quietly into the port , and once there take the ships and assault the fort . The governor of the area , Brigadier Don Gabriel José de Zuloaga had prepared the port defenses very diligently , and Spanish troops were well commanded by Captain Don Francisco Saucedo . On October 22 , Waterhouse entered the port of La Guaira flying the Spanish flag . The port gunners were not deceived by the ruse , and waited until the English squadron was within range , and then simultaneously opened fire . After three hours of heavy shelling , Waterhouse ordered a withdrawal . The battered British squadron then sailed to Jamaica to undertake emergency repairs . In an attempt to explain his actions , Waterhouse argued that the capture of a few small Spanish vessels would not have justified the loss of his men . Capture of Porto Bello ( 20 – 21 November 1739 ) . One of the first major actions was the British capture , on 22 November 1739 , of Porto Bello , a silver - exporting town on the coast of Panama in an attempt to damage Spain ' s finances and weaken its naval capabilities . The poorly defended port was attacked by six ships of the line under Vice Admiral Edward Vernon who captured it within twenty - four hours . The British occupied the town for three weeks before withdrawing , having destroyed its fortifications , port and warehouses . The battle led the Spanish to change their trading practices . Rather than trading at centralised ports with a few large treasure fleets , they began using a larger number of smaller convoys trading at a wide variety of ports . They also began to travel around Cape Horn to trade on the west coast . Porto Bello ' s economy was severely damaged , and did not recover until the building of the Panama Canal nearly two centuries later . In Britain the victory was greeted with much celebration , and in 1740 , at a dinner in honour of Vernon in London , the song " Rule Britannia " was performed in public for the first time . Portobello Road in London is named after this victory and more medals were awarded than for any other event in the eighteenth century . The conquest of a port in Spain ' s American empire was widely considered a foregone conclusion by many Patriot Whigs and opposition Tories who pressed a reluctant Walpole to launch larger naval expeditions to the Gulf of Mexico . First attack on Cartagena de Indias ( 13 – 20 March 1740 ) . Following the success of Portobelo , Vernon decided to focus his efforts on the capture of Cartagena de Indias . Both Vernon and Edward Trelawny , governor of Jamaica , considered the Spanish gold shipping port to be a prime objective . Since the outbreak of the war , and Vernon ' s arrival in the Caribbean , the British had made a concerted effort to gain intelligence on the defenses of Cartagena . In October 1739 , Vernon sent First Lieutenant Percival to deliver a letter to Blas de Lezo and Don Pedro Hidalgo , governor of Cartagena . It was thought that Percival could use the opportunity to make a detailed study of the Spanish defenses . This effort was thwarted when Percival was denied entry to the port . On March 7 , 1740 , in a more direct approach , Vernon undertook a reconnaissance - in - force of the Spanish city . Vernon left Port Royal in command of a squadron including ships of the line , two fire ship s , three bomb vessel s , and transport ships . Reaching Cartagena on March 13 , Vernon immediately landed several men to map the topography and to reconnoiter the Spanish squadron anchored in Playa Grande , west of Cartagena . Having not seen any reaction from the Spanish , on March 18 Vernon ordered the three bomb vessels to open fire on the city . Vernon ' s intention was to provoke a response that might give him a better idea of the defensive capabilities of the Spanish . Understanding Vernon ' s motives , Lezo did not immediately respond . Instead , Lezo ordered the removal of guns from some of his ships , in order to form a temporary shore battery for the purpose of suppressive fire . Vernon next initiated an amphibious assault , but in the face of strong resistance , the attempt to land 400 soldiers was unsuccessful . The British then undertook a three - day naval bombardment of the city . In total , the campaign lasted 21 days . Vernon then withdrew his forces , leaving the HMS " Windsor Castle " and HMS " Greenwich " in the vicinity , with a mission to intercept any Spanish ship that may approach . Destruction of the fortress of San Lorenzo el Real Chagres ( 22 – 24 March 1740 ) . After the destruction of Portobelo the previous November , Vernon proceeded to remove the last Spanish stronghold in the area . He attacked the fortress of San Lorenzo el Real Chagres , on the banks of the Chagres River , near Portobelo . The fort was defended by Spanish patrol boat s , and was armed with four guns and about thirty soldiers under Captain of Infantry Don Juan Carlos Gutiérrez Cevallos . At 3 pm on March 22 , 1740 , the English squadron , composed of the ships " Stafford " , " Norwich " , " Falmouth " and " Princess Louisa " , the frigate " Diamond " , the bomb vessel s " Alderney " , " Terrible " , and " Cumberland " , the fireship s " Success " and " Eleanor " , and transports " Goodly " and " Pompey " , under command of Vernon , began to bombard the Spanish fortress . Given the overwhelming superiority of the British forces , Captain Cevallos surrendered the fort on March 24 , after resisting for two days . Following the strategy previously applied at Porto Bello , the British destroyed the fort , and seized the guns along with two Spanish patrol boats . During this time of British victories in the Caribbean , events taking place in Spain would prove to have a significant impact on the outcome of the largest engagement of the war . Spain had decided to replace Don Pedro Hidalgo as governor of Cartagena de Indias . However , the new governor - designate , Lieutenant General of the Royal Armies Sebastián de Eslava y Lazaga had to first dodge the Royal Navy in order to get to his new post . Starting from the Galician port of Ferrol , the vessels " Galicia " and " San Carlos " set out on the journey . Hearing the news , Vernon immediately sent four ships to intercept the Spanish . They were , however , unsuccessful in their mission . The Spanish managed to circumvent the British interceptors and entered the port of Cartagena on April 21 , 1740 , landing there with the new governor and several hundred veteran soldiers . Second attack on Cartagena de Indias ( May 3 , 1740 ) . In May , Vernon returned to Cartagena de Indias in charge of 13 warships , with the intention of bombarding the city . Lezo reacted by deploying his six ships of the line so that the British fleet was forced into ranges where they could only make short or long shots that were of little value . Vernon withdrew , asserted that the attack was merely a manoeuver . The main consequence of this action was to help the Spanish test their defenses . Third attack on Cartagena de Indias ( March 13 – May 20 , 1741 ) . The largest action of the war was a major amphibious attack launched by the British under Admiral Edward Vernon in March , 1741 against Cartagena de Indias , one of Spain ' s principal gold - trading ports in their colony of New Granada ( today Colombia ) . Vernon ' s expedition was hampered by inefficient organisation , his rivalry with the commander of his land forces , and the logistical problems of mounting and maintaining a major trans - Atlantic expedition . The strong fortifications in Cartagena and the able strategy of Spanish Commander Blas de Lezo were decisive in repelling the attack , with heavy losses on the British side . Furthermore , in the unfamiliar tropical climate , the newly arrived British and American troops succumbed in large numbers to virulent tropical disease , primarily yellow fever . The extreme ease with which the British destroyed Puerto Bello ( which did not regain its importance until the construction of the Panama Canal ) led to a change in British plans . Instead of concentrating his next attack on Havana with the intention of conquering Cuba , as expected , Vernon departed to New Granada to attack Cartagena de Indias , the main port of the Viceroyalty and main point of the Indian fleet to the Iberian Peninsula . The British then concentrated , in Jamaica , one of the largest fleets ever assembled . The fleet consisted of 186 ships ( 60 more than the famous Spanish Armada of Philip II ) including 2620 artillery pieces and more than 27 , 000 men . Of that number , 10 , 000 were soldiers responsible for initiating the assault . There were also 12 , 600 sailors , 1 , 000 Jamaican slaves and macheteros , and 4000 recruits from Virginia led by Lawrence Washington ( 1718 - 1752 ) , the older half - brother of George Washington , future President of the United States . The task of defending the fortified city was given to Admiral Blas de Lezo , a marine veteran hardened by numerous naval battles in Europe beginning with the War of Spanish Succession and by confrontations with European pirates in the Caribbean Sea and Pacific Ocean and Barbary pirates in the Mediterranean Sea . Assisting in that effort were Melchor de Navarrete and Carlos Desnaux , with a squadron of six ships of the line ( the flagship vessel Galicia together with the San Felipe , San Carlos , África , Dragón , and Conquistador ) and a force of 3 , 000 soldiers , 600 militia and a group of native Indian archers . Vernon first ordered the port cleared of all scuttled ships . Then , on March 13 , 1741 , he landed a contingent of troops under command of Major General Thomas Wentworth and artillery for the purpose of taking Fort de San Luis de Bocachica . In support of that action , the British ships simultaneously opened with cannon fire , at a rate of 62 shots per hour . In turn , Lezo ordered four of the Spanish ships to aid 500 of his troops defending Desnaux ' s position , but the Spanish eventually had to retire to the city , which was already beginning to be evacuated by civilians . After evacuating Fort Bocagrande , the Spanish regrouped at Fort San Felipe de Barajas while Washington ' s Virginians took up positions in the nearby hill of La Popa . Vernon , believing the victory at hand , sent a message to Jamaica stating that he had taken the city . The report was subsequently forwarded to London , where there was much celebration . Commemorative medals were minted , depicting the defeated Spanish defenders kneeling before Vernon ( ) . The robust image of the enemy , depicted in the British medals , bore little resemblance to the real life Lezo . Maimed by years of battle , he was one - eyed and lame , with limited use of one hand . On the evening of April 19 , the British mounted an assault in force upon San Felipe . Three columns of grenadiers supported by Jamaicans and several British companies moved under cover of darkness , with the aid of an intense naval bombardment . The British fought their way to the base of the fort ' s ramparts where they discovered that the Spanish had dug deep trenches at the foot of the defensive walls . This effectively rendered the British scaling equipment too short for the task . This stymied the British advance , since the fort ' s walls had not been breached , and the ramparts could not be topped . Neither could the British easily withdraw , in the face of intense Spanish fire and under the weight of their own equipment . The Spanish seized on this opportunity , with devastating effect . Reversing the tide of battle , the Spanish initiated a fixed bayonet charge at first light , inflicting heavy casualties upon the British . The surviving British forces retreated to the safety of their ships . The British maintained a naval bombardment , sinking what remained of the small Spanish squadron ( after Lezo ' s decision to scuttle some of his ships in an effort to block the harbor entrance ) . Nonetheless , the Spanish managed to thwart any attempt by the British to land another ground assault force . The British troops were required to remain aboard ship for a month , without sufficient reserves . With supplies running low , and with the outbreak of disease ( primarily yellow fever ) that took the lives of many of those confined to the crowded ships , Vernon was forced to raise the siege on May 9 and return to Jamaica . Six thousand British died . Spanish casualties are listed as just under one thousand dead . The engagement is considered to be among the greatest defeats of the Royal Navy . Vernon carried on , successfully attacking the Spanish at Guantanamo Bay , Cuba . On March 5 , 1742 , with the help of reinforcements from Europe , he launched an assault on Panama City , Panama , hoping to repeat the success of Portobelo . That attack was not completely successful . In 1742 , Vernon was replaced by Admiral of the Fleet Chaloner Ogle and returned to England , where he gave an accounting to the Admiralty , and found that he had been elected MP for Ipswich . Vernon maintained his naval career for another four years before retiring in 1746 . In an active Parliamentary career Vernon advocated an improvement in naval procedures and he continued to hold an interest in naval affairs until his death in 1757 . News of the defeat at Cartagena was a significant factor in the downfall of the British Prime Minister Robert Walpole . Walpole ' s anti - war views were considered by the Opposition to have contributed to his poor prosecution of the war effort . The new government under Lord Wilmington wanted to shift the focus of Britain ' s war effort away from the Americas and into Mediterranean . Spanish policy , dictated by Elisabeth of Parma , also moved towards recovering lost Spanish possessions in Italy from the Austrians . In 1742 a large British fleet under Nicholas Haddock was sent to try and intercept a Spanish army being transported from Barcelona to Italy , which he failed to do . Lawrence Washington survived the yellow fever outbreak , and eventually retired to Virginia . He named his estate Mount Vernon , in honour of his former commander . Anson expedition . The success of the Porto Bello operation led the British in September 1740 to send a squadron under Commodore George Anson to attack Spain ' s possessions in the Pacific . Before they even reached the Pacific a large number of the expedition had died from disease , and they were in no shape to launch any sort of attack . Anson reassembled his force in the Juan Fernández Islands , allowing them to recuperate before he moved up the Chilean coast , raiding the small town of Paita . However he reached Acapulco too late to intercept the yearly Manila galleon , which had been one of the principal objectives of the expedition . He retreated across the Pacific , running into a storm that forced him to dock for repairs in Canton . After this he made a final attempt to intercept the Manila galleon the following year . This he did on 20 June 1743 off Cape Espiritu Santo capturing more than a million gold coins . Anson then sailed home , eventually arriving back in London more than three and a half years after he had set out , having circumnavigated the globe in the process . Less than a tenth of the force had survived the expedition , but Anson ' s achievements helped establish his name and wealth in Britain , leading to his appointment as First Lord of the Admiralty . Florida . In 1740 the inhabitants of Georgia launched an overland attack on the fortified city of St . Augustine in Florida , supported by a British naval blockade , but were repelled . The British forces led by James Oglethorpe , the Governor of Georgia , besieged St . Augustine for over a month before retreating , abandoning their artillery in the process . The failure of the Royal Navy blockade to prevent supplies reaching the settlement was a crucial factor in the collapse of the siege . Oglethorpe then began preparing Georgia for an anticipated Spanish assault . French neutrality . When war had broken out in 1739 it was expected in both Britain and Spain that France would join the war on the Spanish side . This played a large role in the tactical calculations of the British . If the Spanish and French were to operate together they would have a superiority of ninety ships of the line . In 1740 there was an invasion scare when it was believed that a French fleet at Brest and a Spanish fleet at Ferrol were about to combine and launch an invasion attempt on Britain itself . Although this proved not to be the case , the British kept the large bulk of their naval and land forces in southern England to act as a deterrent . Many in the British government were afraid to launch a major offensive against the Spanish , for fear that a large British victory would draw France into the war to protect the balance of power . Raids on Santiago de Cuba , La Guaira and Puerto Cabello . Several other British attacks took place in the Caribbean with little consequence on the geopolitical situation in the Atlantic . The weakened British forces under Vernon launched an attack against Cuba , landing in Guantánamo Bay with a plan to march the 45 miles to Santiago de Cuba and capture the city . Vernon again clashed with the army commander , and the expedition withdrew when faced with heavier Spanish opposition than expected . Vernon remained in the Caribbean until October 1742 , before heading back to Britain and Chaloner Ogle taking command of a very sickly fleet that had less than half its sailors fit for duty . The following year a smaller force led by Charles Knowles made raids upon the Venezuelan coast , attacking La Guaira on 2 March 1743 . Having suffered 97 killed and 308 wounded over three days , Knowles decided to retire west before sunrise on 6 March and attack nearby Puerto Cabello . Despite instructing his captains to rendezvous at Borburata Keys — east of Puerto Cabello — the detached " Burford " , " Norwich " , " Assistance " , and " Otter " proceeded to Curaçao , compelling the commodore to angrily follow them in . On 28 March he sent his smaller ships to cruise off Puerto Cabello , and once his main body had been refitted , went to sea again on 31 March , only to then struggle against contrary winds and currents for two weeks before finally diverting to the eastern tip of Santo Domingo by 19 April . Invasion of Georgia . In 1742 the Spanish launched an attempt to seize the British colony of Georgia . Two thousand troops under the command of Manuel de Montiano landed on St Simons Island . General Oglethorpe rallied the local forces and defeated the Spanish regulars at Bloody Marsh and Gully Hole Creek , forcing them to withdraw . Border clashes between Florida and Georgia continued for the next few years , but there were no further offensive operations on the American mainland by either nation . Merger with wider war . By mid - 1742 the War of the Austrian Succession had broken out in Europe . Principally fought by Prussia and Austria over possession of Silesia , the war soon engulfed most of the major powers of Europe , who joined two competing alliances . The scale of this new war dwarfed any of the fighting in the Americas , and had drawn the main attention of Britain and Spain to operations on the European continent . The return of Vernon ' s fleet in 1742 marked the end of major offensive operations in the War of Jenkins ' Ear . This was confirmed by the entry of France into the war in 1744 . France placed their emphasis on the war in Europe , and planned an ambitious invasion of Britain . While it ultimately failed , it further persuaded the British policy makers of the dangers of sending significant forces to the Americas which might be needed at home . No further attacks were attempted on Spanish possessions , but in 1745 , a colonial expedition under William Pepperrell supported by a British fleet under Commodore Peter Warren was successful against the French fortress of Louisbourg on Cape Breton Island . Pepperrell was knighted for his achievement , but Louisbourg was returned to the French by the Treaty of Aix - La - Chapelle in 1748 . Ironically , it had to be re - captured by British Forces under Amherst and Wolfe in 1758 , during the Seven Years ( French and Indian ) War . See Francis Parkman , " A Half Century of Conflict II " and " Montcalm and Wolfe II " . Privateering . The war involved privateering by both sides . Anson captured a valuable Manila galleon but this was more than offset by the Spanish privateering attacks on the British transatlantic triangular trade route . They seized hundreds of British ships , operating with virtual impunity in the West Indies ; they were also active in European waters . The Spanish convoys proved almost unstoppable and so , during the Austrian phase of the war , the British attacked poorly protected French merchantmen instead . Lisbon Negotiations . From August 1746 negotiations were commenced in the neutral city of Lisbon to try to arrange a peace settlement . The death of Philip V of Spain had brought his son Ferdinand VI to the throne , and he was more willing to be concillitary over the issues of trade . However , because of their commitments to their Austrian allies , the British were unable to agree to Spanish demands for territory in Italy and talks broke down . Aftermath . The eventual diplomatic resolution formed part of the wider settlement of the War of the Austrian Succession by the Treaty of Aix - la - Chapelle . The issue of the asiento was not mentioned in the treaty , as it had lessened in importance to both nations . The issue was finally settled by the 1750 Treaty of Madrid in which Britain agreed to renounce its claim to the asiento in exchange for a payment of £100 , 000 and allowed British trade with Spanish America under favourable conditions . Relations between Britain and Spain dramatically improved during subsequent years thanks to a concerted effort by the Duke of Newcastle to cultivate Spain as an ally . A succession of Anglophile ministers were appointed in Spain including José de Carvajal and Ricardo Wall – all of whom were on good terms with the British Ambassador Benjamin Keene in an effort to avoid a repeat of the War of Jenkins ' Ear . One of the results of this was the Spanish decision to remain neutral during the early part of the Seven Years ' War . The Spanish Empire in the Caribbean remained intact and its trading routes and resources were later used by Spain to help the cause of the American Revolution . The War of Jenkins ' Ear is commemorated annually on the last Saturday in May at Wormsloe Plantation in Savannah , Georgia .