Britain declared war on Spain because a sea captain walked into Parliament, opened a box, and showed them his severed ear — which had been sitting in the box for seven years.
In 1731, Spanish coast guards boarded a British merchant ship in the Caribbean, accused the captain of smuggling, and cut off his ear. The captain, Robert Jenkins, preserved the ear in a jar and kept it for years. Nobody much cared — until 1738, when opposition politicians dragged him before Parliament to wave the shriveled ear as evidence of Spanish brutality.
The ear became a rallying cry for British merchants who were furious at Spain's interference with their Caribbean trade. Parliament erupted. Prime Minister Robert Walpole, who wanted peace, was overruled by public outrage and a war party in Parliament. In 1739, Britain declared war over what was officially framed as a matter of national honor — and an ear in a jar.
The war's first major engagement was a stunning British success: Admiral Edward Vernon captured the Spanish port of Portobelo, Panama with just six ships. The victory was celebrated so wildly across Britain and its colonies that streets and taverns were named after it — including the Portobello Road in London, which still carries that name today.
The war's defining disaster came at Cartagena de Indias in 1741, where Britain assembled the largest amphibious force in the Western Hemisphere to date — 186 ships and 23,600 men. The city was defended by a one-eyed, one-armed, one-legged Spanish admiral named Blas de Lezo, who had lost each limb in separate battles and had zero intention of surrendering. The British siege collapsed after six weeks, with disease killing far more men than Spanish guns.
The War of Jenkins' Ear was eventually absorbed into the larger War of Austrian Succession by 1742, its original cause forgotten amid European power politics. Britain achieved none of its trade objectives in Spanish America, and the asiento slave trade concessions at stake were quietly settled years later by treaty. The whole thing ended largely where it started.
The war's most lasting legacy may be entirely accidental. A young Virginian named Lawrence Washington served in the failed Cartagena expedition under Admiral Vernon. So impressed was he by Vernon that Lawrence named his estate 'Mount Vernon' in his honor. Lawrence was the half-brother of George Washington, who inherited the estate — giving America's most famous home its name.