The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.
Francis Trevelyan Miller, Ed.

Fort Pickens.

Fort Pickens, guarding the entrance to Pensacola Bay, 1861. Never was a perilous position more gallantly held than was Fort Pickens by Lieutenant A. J. Slemmer and his little garrison from January to May, 1861. A large force of Confederates were constantly menacing the fort. Slemmer discovered a plot to betray the Fort into the hands of a thousand of them on the night of April 11th. Attempts to seize the Fort by Confederates gathered in force for the purpose were held off only by the timely arrival of gunboats with reenforcements from the North. All the efforts to take Fort Pickens failed and it remained in the hands of the Federals throughout the war. In the lower picture we see one of the powerful Confederate batteries at Fort McRee, which fired on Pickens from across the channel.

The threatened Fort: Fort Pickens, guarding the entrance to Pensacola Bay, 1861.

Artillery at Fort Pickens.