Pensacola Pass

Pensacola Pass is the gap four empires fortified — the entrance to the finest deep-water harbor on the Gulf, where Spain, France, Britain, and the United States all built to control the same mile of water between Santa Rosa Island and the mainland. The Americans made it a fortress triangle: Pickens on the island tip, McRee on the western shore, Barrancas on the bluff — the pass guarded by three sets of guns that could crossfire anything entering the bay.

The pass watched the war arrive early. In January 1861 — three months before Sumter — Florida militia demanded Fort Barrancas; Lieutenant Adam Slemmer spiked the guns, dumped the powder in the bay, and slipped his garrison across the channel to Fort Pickens. For a year the harbor stood divided — Union Pickens staring across the pass at Confederate Barrancas and McRee, the guns aimed at each other across the same water they'd been built to defend.

The standoff broke in October 1861 — Bragg sent a thousand men across to raid the Union camp on Santa Rosa Island, the first significant engagement in Florida — and ended the next spring when the Confederates burned the navy yard and left for New Orleans. Fort Pickens never fell — one of only four southern forts held by the Union for the entire war. The pass kept its guns into the twentieth century — the coastal artillery era's batteries still stud Santa Rosa and Perdido Key, the channel still deep, the fort still watching from the island tip.

Pensacola Pass is the archive's harbor-mouth file — the Gulf entrance guarded by three forts, where Slemmer's 1861 move to Pickens held a southern fort for the Union all four years of the war.