The siege and capture of the British forts at Pensacola in April and May of 1781 brought to a climax Spanish participation in the American Revolution. The project was begun by Bernardo de GaIvez, the young governor of Louisiana who had already conquered the British posts in the Mississippi Valley and at Mobile Bay. The British still held out at Pensacola, their principal establishment in the Gulf of Mexico. Galvez landed there on March 18, and his force was soon augmented by troops from Mobile and New Orleans. It was not until the French and Spanish troops from Havana arrived at Pensacola on April 19, however, that the siege could be undertaken with hope of success.
Worcester, Donald E.
"Miranda’s Diary of the Siege of Pensacola, 1781,"
Florida Historical Quarterly: Vol. 29
, Article 3.
Available at: https://stars.library.ucf.edu/fhq/vol29/iss3/3