The Battle of Cartagena de Indias occurred during the War of Jenkins' Ear (1739-1748), a conflict rooted in long-standing commercial tensions between Spain and Great Britain. The war was primarily fought in the Caribbean, where the British pursued a strategy of capturing key Spanish ports including Porto Bello and Chagres in Panama, Havana, and Cartagena de Indias in present-day Colombia. This siege represented the third British attempt to take Cartagena de Indias, following two failed naval attacks in 1740.
In March 1741, the British undertook a combined naval and land campaign to overcome previous failures. The British initially achieved success by destroying the chain barrier that blocked the narrow channel of Boca Chica and capturing Fort San Luis. However, the campaign's momentum was halted when a night assault on Fort San Lazaro failed. Unable to overcome Spanish defenses at this position, the British were compelled to retreat from the siege.
The British retreat was marked by devastating casualties, with fatalities ranging from 9,500 to 11,500 personnel, the majority of whom died from disease rather than combat. Some British military units experienced death rates as high as 80 to 90 percent. The Spanish victory at Cartagena de Indias demonstrated Spain's capacity to defend its colonial holdings against British assault. This successful defense largely concluded major military operations in the Caribbean theater, prompting both nations to redirect their military resources toward the wider European conflict known as the War of the Austrian Succession.
The Mexican-American War (1846–1848) grew from the annexation of Texas (1845) and a disputed border between Texas and Mexico at the Rio Grande. President James K. Polk ordered US troops under General Zachary Taylor into the contested zone; after a skirmish that killed American soldiers, Congress declared war in May 1846. US forces won a series of engagements — Palo Alto, Monterrey, Buena Vista — before General Winfield Scott led an amphibious landing at Veracruz and an overland campaign to Mexico City, which fell in September 1847. The Treaty of Guadalupe Hidalgo (February 1848) transferred California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming to the United States in exchange for $15 million and assumption of $3.25 million in claims — roughly 525,000 square miles, a 67 percent expansion of US territory. The war's outcome immediately reopened the slavery question: the Wilmot Proviso, debated throughout the war, proposed banning slavery from any territory acquired from Mexico, foreshadowing the sectional crisis of the 1850s.
British: 9,500–11,500 fatalities (largely from disease), with some units suffering death rates of 80–90 percent
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