When Spain entered the American War of Independence in 1779, the contest in Central America intensified. Britain had logging settlements on the Yucatan coast -- what would become Belize -- and outposts along the Mosquito Coast. The Spanish Captaincy General of Guatemala claimed most of this territory. After the Spanish seized St. George's Caye, one of Britain's principal island settlements, many British colonists fled to Roatan. The island became a base for Edward Marcus Despard, a British commander who ran guerrilla operations to maintain influence along the Mosquito Coast and authorized privateering raids against Spanish shipping. Roatan was not merely a refuge; it was a staging ground for an entire shadow war.

Matias de Galvez, the Captain General of Spanish Guatemala, had received orders from King Charles III to "dislocate the English from their hidden settlements on the Gulf of Honduras." He began raising forces as early as 1780, eventually assembling as many as 15,000 militia with financial support from across the Spanish colonial empire. Logistics and diplomacy delayed action until after Yorktown, when the possibility that Britain might redeploy troops to Central America made speed essential. In early 1782, Galvez staged 600 troops at Trujillo for the assault on Roatan and dispatched additional forces overland toward the British settlement at Black River. On March 12, he embarked his assault force under escort of three frigates -- the Santa Matilde, Santa Cecilia, and Antiope -- commanded by Commodore Enrique MacDonell.

The Spanish fleet arrived off Roatan at six in the morning on March 13. After a few ineffective cannon shots from shore, the ships anchored out of range. MacDonell, who spoke English, rowed in under a flag of truce to request surrender. The defenders asked for six hours to think it over, and Galvez agreed. When the deadline passed, the answer came back: they would fight "to the death." Spanish sailors had already noticed the British using the grace period to reinforce their positions. High winds and rough seas delayed the assault for three days. On the morning of March 16, Spanish guns opened up against Forts Dalling and Despard, which guarded the harbor mouth with twenty cannons. By one in the afternoon, the British guns fell silent. Troops began landing under Major General Gabriel Herbias, and the warships entered the harbor to rake the town. British artillery answered from the hills above until sunset, when the defenders capitulated.

The human cost was immediate and starkly divided by status. Captured British soldiers and 135 civilians were shipped to Havana to await prisoner exchange. Three hundred enslaved people received a different fate: they were auctioned off in the Cuban slave markets, their lives traded as spoils of a war fought in the name of empire. The Spanish destroyed the settlement entirely, claiming it had served as a base for piracy and privateering. Galvez continued his campaign along the coast to eliminate British influence, but the effort produced only temporary results. Britain maintained a colonial presence in Central America, and the Bay Islands would change hands repeatedly in the centuries that followed. Today, Roatan draws cruise ships and scuba divers to the very harbor where Spanish cannonballs silenced British guns -- though few visitors know the ground beneath them was once contested in a revolutionary war fought an ocean away from its most famous battlefields.