The Battle of Fort Charlotte or the siege of Fort Charlotte was a two-week siege conducted by Spanish General Bernardo de Gálvez against the British fortifications guarding the port of Mobile (which was then in the British province of West Florida, and now in Alabama) during the Anglo-Spanish War of 1779-1783. Fort Charlotte was the last remaining British frontier post capable of threatening New Orleans in Spanish Louisiana. Its fall drove the British from the western reaches of West Florida and reduced the British military presence in West Florida to its capital, Pensacola.