Cartagena Holds Off a Huge British Fleet

In March 1741, a massive British amphibious force assembled off the coast of Cartagena de Indias in modern Colombia, aiming to seize control of the fortified port for the Crown. The assault formed the primary offensive of the War of Jenkins' Ear, a conflict sparked by long-running commercial rivalries and illicit smuggling across the Caribbean basin. Commanded at sea by Vice-Admiral Edward Vernon and on land by Brigadier General Thomas Wentworth, the expedition comprised some 186 vessels and well over 20,000 men, including British regulars, marines, and some 3,600 North American colonial troops. Facing them within the reinforced city and its outlying bastions were approximately 4,000 to 6,000 defenders, directed by the viceroy of New Granada, Sebastian de Eslava, and the veteran naval commander Don Blas de Lezo.

The British operation opened with an assault on Boca Chica, the narrow channel that provided the only deep-water passage into Cartagena's expansive harbor. Ships under Sir Chaloner Ogle silenced peripheral coastal batteries before engineers and infantry went ashore on the peninsula of Tierra Bomba. Troops spent nearly two weeks establishing land batteries to batter Fort San Luis, while scuttled Spanish warships partly obstructed the narrow entryway. After sustained bombardment opened a breach in the fort on 5 April, Spanish forces abandoned the outer perimeter and withdrew toward the inner harbor, enabling the British fleet to penetrate the outer lagoon and land forces closer to the city itself.