In 1738, British merchant captain Robert Jenkins appeared before the House of Commons holding a pickled ear. He claimed that Spanish coast guards had boarded his ship seven years prior and sliced it off. The sensationalized incident whipped public opinion into a frenzy, pushing a reluctant British government to declare war against Spain in 1739. The resulting "War of Jenkins' Ear" eventually merged into the larger War of the Austrian Succession.
An Incident off the Coast of Cuba
In April 1731, the British merchant brig Rebecca, captained by Robert Jenkins, was sailing near the coast of Havana on its return voyage from the West Indies to London. The vessel was intercepted and boarded by a Spanish coast guard patrol ship, La Isabela, commanded by Captain Juan de León Fandiño. Spanish authorities were on high alert for foreign smugglers breaching Spain's trade monopoly with its American colonies. Suspecting Jenkins of carrying contraband, the Spanish boarding party ransacked the ship's hold and confronted the captain.
According to Jenkins, the encounter turned violent when Spanish crewmen tied him to a mast and interrogated him about hidden goods. During the struggle, Captain Fandiño drew his cutlass and sliced off Jenkins's left ear. Fandiño allegedly handed the severed appendage back to the merchant mariner with a mocking message for King George II, daring the British monarch to respond. Jenkins carefully preserved the severed ear, eventually placing it in a jar of spirits as physical evidence of the attack.
When Jenkins finally returned to England later that year, he reported the assault to government officials, including the Secretary of State, the Duke of Newcastle. While the incident provoked indignation among London merchants, it did not immediately cause a rupture between the two nations. For several years, the matter remained an unresolved diplomatic complaint while commercial tensions between Britain and Spain continued to simmer across the Atlantic.
The violent boarding of the Rebecca was not an isolated clash, but a symptom of deep structural tensions established by the 1713 Treaty of Utrecht. Under the treaty, which had concluded the War of the Spanish Succession, Spain granted Great Britain the Asiento de Negros—a thirty-year monopoly allowing the British South Sea Company to supply 4,800 enslaved African people annually to Spanish America. The agreement also permitted a single British merchant ship, known as the navío de permiso, to trade up to 500 tons of goods per year at the annual fair in Portobelo.
British merchants routinely sought to circumvent these tight restrictions, exploiting the trade window to conduct widespread smuggling throughout the Caribbean. In response, the Spanish Crown empowered private coast guard vessels, or guardacostas, to intercept and search foreign shipping in colonial waters. These privateers received a portion of any seized cargo, which created a powerful financial incentive to stop British merchant vessels indiscriminately, often seizing legal goods under the pretext of curbing contraband trade.
British commercial interests flooded Parliament with petitions protesting the seizure of ships and the harsh treatment of British sailors by Spanish crews. Simultaneously, Spain complained that British merchants systematically evaded colonial customs and that the South Sea Company failed to pay required duties to the Spanish Crown. By the late 1730s, the Atlantic trade relationship had deteriorated into persistent mutual suspicion and maritime harassment.
The Pickled Ear and Parliamentary Politics
In 1738, domestic politics in London brought Jenkins's seven-year-old grievance into national prominence. The British government was led by Prime Minister Sir Robert Walpole, who pursued a policy of peace and financial stabilization, seeking to resolve maritime disputes with Spain through diplomatic negotiation. However, a coalition of parliamentary opponents—comprising Patriot Whigs and Tories—sought to undermine Walpole's administration by framing his foreign policy as weak and submissive.
Jenkins was summoned to testify before a committee of the House of Commons, where he presented his account of the 1731 mutilation. Popular accounts held that he dramatically exhibited his preserved ear before the assembled lawmakers, declaring that he had committed his soul to God and his cause to his country. While modern historians question whether the physical ear was actually displayed during the committee proceedings, the political effect of the testimony was immediate and electric.
The sensationalized story swept through newspapers, coffee houses, and parliamentary debates, generating immense public outrage. Walpole attempted to avert war by negotiating the Convention of Pardo in early 1739, an agreement to settle mutual financial claims. However, public and parliamentary clamor rendered the compromise politically unacceptable. Facing overwhelming domestic pressure, Walpole yielded, and Britain formally declared war on Spain in October 1739. The conflict was not officially titled the 'War of Jenkins' Ear' at the time; that moniker was coined more than a century later, in 1858, by the Scottish historian Thomas Carlyle.
Opening Strikes and the Triumph at Portobelo
British strategy focused heavily on striking Spanish colonial trade hubs in the Caribbean to disrupt the flow of silver and secure commercial dominance. Admiral Edward Vernon, a prominent naval officer and vocal critic of Walpole in Parliament, had previously boasted that he could capture the major Spanish transit port of Portobelo in modern-day Panama with just six warships. Given command of a Caribbean squadron, Vernon was dispatched to make good on his claim.
In November 1739, Vernon arrived off the coast of Portobelo and launched an amphibious assault against the poorly garrisoned Spanish fortifications. The British naval bombardment and landing parties overwhelmed the defenders in less than two days, leading to the surrender of the town. Vernon ordered the destruction of the harbor's fortifications, captured Spanish naval vessels, and seized military supplies, while strictly forbidding his men from looting private civilian property.
The capture of Portobelo sparked jubilant celebrations across Great Britain. Vernon became an immediate national hero; commemorative medals were struck in his honor, London's Portobello Road was named after the victory, and the patriotic anthem 'God Save the King' gained widespread popularity during public festivities. The swift triumph reinforced British confidence that naval power alone could easily dismantle the Spanish Empire in the Americas.
The Disaster at Cartagena de Indias
Emboldened by the success at Portobelo, the British government assembled a massive combined expeditionary force in 1741 to strike Cartagena de Indias, located in present-day Colombia. Cartagena served as the primary fortified storehouse for South American silver before shipment to Europe. The British assault fleet, led by Vernon, comprised nearly two hundred vessels and roughly thirty thousand soldiers and sailors, making it one of the largest naval forces ever deployed in the Atlantic up to that time.
The defense of Cartagena was overseen by the seasoned Spanish naval commander Blas de Lezo, who had lost an eye, a leg, and the use of an arm in earlier campaigns. Despite being vastly outnumbered with only around three to four thousand defenders and six ships of the line, de Lezo utilized the city's formidable masonry fortresses, deep harbor defenses, and submerged obstacles to slow the British advance and force a protracted siege.
As the siege dragged on through the tropical rainy season, the British expedition suffered from severe friction and lack of cooperation between Admiral Vernon and the land force commander, General Thomas Wentworth. Tropical diseases, primarily yellow fever, malaria, and dysentery, quickly devastated the British ranks. After a disastrous, repulsed assault on the fortress of San Felipe de Barajas, British casualties and disease rates became unsustainable, forcing a chaotic evacuation with tens of thousands dead from combat and illness.
Expansion into a Global War
While naval campaigns raged in the Caribbean, secondary operations opened across other colonial frontiers. In North America, General James Oglethorpe led colonial forces from the newly founded province of Georgia to invade Spanish Florida, besieging St. Augustine in 1740 before being repelled. In 1742, Spanish forces launched a counter-invasion of Georgia, which Oglethorpe defeated at the Battle of Bloody Marsh, effectively stabilizing the contested southern border.
Farther afield, Commodore George Anson led a British naval squadron into the Pacific Ocean to harass Spanish colonies and shipping. Although Anson lost several vessels to storms, disease, and starvation during his voyage around Cape Horn, he successfully circumnavigated the globe and captured the heavily laden Manila galleon Nuestra Señora de Covadonga off the Philippines in 1743, securing immense plunder for Britain.
By 1740, the death of Emperor Charles VI triggered the War of the Austrian Succession in Europe, drawing France, Prussia, Austria, and other European powers into a broad continental conflict. The maritime war between Britain and Spain rapidly merged into this larger struggle. When peace was finally concluded with the Treaty of Aix-la-Chapelle in 1748, the original territorial and trade disputes remained largely unresolved, with both empires agreeing to a status quo ante bellum that returned captured positions and phased out the Asiento agreement.
Key takeaways
•The 1731 mutilation of Captain Robert Jenkins became a political tool seven years later to pressure Prime Minister Robert Walpole's administration into declaring war against Spain.
•Underlying the conflict were deep-seated tensions over the 1713 Treaty of Utrecht, which had created friction between British smuggling networks and aggressive Spanish coast guard patrols.
•Despite early British naval success at Portobelo, the massive 1741 amphibious assault on Cartagena de Indias ended in catastrophic failure due to fortified Spanish resistance and rampant tropical disease.
•The regional maritime war quickly merged into the broader War of the Austrian Succession (1740–1748), ultimately ending with the Treaty of Aix-la-Chapelle restoring the territorial status quo.