The First Shots: Fort Sumter and the Opening of the American Civil War

April 12, 1861. Charleston Harbor, South Carolina.

Before dawn, the harbor was quiet.

Inside Fort Sumter — a brick pentagon rising from a man-made island at the mouth of Charleston Harbor — Major Robert Anderson commanded a garrison of 85 men: 8 officers, 68 enlisted men of the 1st U.S. Artillery, and 9 musicians and laborers. They had been there since December 1860, when Anderson relocated his command from the more exposed Fort Moultrie on Sullivan's Island. He understood, even then, what was coming.

By the spring of 1861, he had been watching Confederate forces ring the harbor for months. Battery by battery, position by position. The men inside Fort Sumter could see them building.

At approximately 4:30 in the morning on April 12, 1861, the first shell arced across the harbor.

The Geography of Encirclement

To understand what Anderson faced, you need to understand the harbor.

Charleston Harbor is not a simple bay. It is a network of islands, channels, and marshland — and the Confederates used every piece of it.

The hand-drawn map produced during the bombardment makes the tactical reality unmistakable. Fort Sumter sits in the center of the harbor like a target. From every direction, Confederate batteries drew lines of fire directly onto the fort.

From Morris Island to the southwest: Cummings Point battery, the ironclad floating battery, Trapier's Battery — fire coming from three sides simultaneously.

From Sullivan's Island to the northeast: Fort Moultrie — the very position Anderson had abandoned months earlier — now turned against him. Mortar batteries. Columbiads. An ironclad battery of four guns.

From Fort Johnson to the west: additional artillery trained on the fort's walls.

From Mount Pleasant: mortar fire.

The sketch prepared by Captain John G. Foster for the Committee on the Conduct of the War documents ten distinct battery positions. Lines of trajectory converge on a single point in the harbor. The geometry is patient and total. Anderson had no avenue of relief, no angle of escape. The map does not require annotation to communicate what it meant to be inside that fort.

34 Hours

The bombardment lasted approximately 34 hours.

The Union garrison returned fire when they could, but they were outgunned, low on powder, and under orders to conserve men. They fired carefully. They held the walls.

By April 13, Fort Sumter was burning. The wooden barracks had caught. Shells had breached the masonry. Smoke moved through the gun positions. Anderson, his men still alive, made the decision to surrender.

No Union soldiers died during the bombardment itself. Two men died in an accidental explosion during the 100-gun salute fired as Anderson lowered his flag — a final, bitter detail that history tends to obscure.

Anderson and his garrison were permitted to leave with their arms and colors. They boarded vessels and departed Charleston Harbor.

The war that would cost at least 620,000 American lives — and by some modern estimates considerably more — had begun.

What the Maps Record

The blueprint of Fort Sumter — dated March 27, 1865, near the end of the war — shows what four years of bombardment did to the structure Anderson surrendered in 1861. The interior has been rebuilt, reinforced, reconfigured.

The fort that stood in April 1861 and the fort that the Union finally recaptured in February 1865 are the same structure only by name.

The maps in this collection do not simply depict a battle. They document a moment of consequence — the topography of the decision that opened the American Civil War. The batteries annotated on these charts were not symbols. They were real positions, real guns, real trajectories. The lines drawn from Cummings Point and Fort Moultrie converged on real men standing in a real structure in the middle of a real harbor.

Geography shaped what happened. The maps show you why.

The 165th Anniversary

On April 12, 2026, it will have been 165 years since the first shell crossed Charleston Harbor.

Fort Sumter stands today as a National Monument. The harbor looks much as the maps record it. The positions are still there — Sullivan's Island, Morris Island, the channel between them. You can stand at Cummings Point and look toward where the fort sits, and the distance is exactly what the sketch shows.

For those whose families served in the Civil War — on either side — these maps offer something no photograph can: the ground itself. The terrain. The position. The reason this place, and not another, was where it began.

Battle Archives reproduces the Fort Sumter bombardment maps at archival quality — high-resolution scans, period-faithful typography, Giclée printing on Hahnemühle paper. These are not decorative prints. They are primary maps, preserved and made available for the rooms and collections where history is taken seriously.