Fort Barrancas
Details:
On Jan. 8, 1861, United States Army guards repelled a group of men intending to take Fort Barrancas in Pensacola Harbor. Historians say that this event could be considered the first shots fired on Union forces in the Civil War.
Fort Barrancas, located on a barrier island, was one of four fortified areas that marked the southern defenses. Fort Barrancas has been a site for harbor fortifications since 1763, when the British built a fort. The Spanish captured Pensacola from the British in 1781 and constructed their own fortification on the site, calling it San Carlos de Barranca. The Spanish word barranca means bluff, which fairly describes the location of the fort.
Read the full story at: Military History Online