Second Battle of Charleston Harbor
Second Battle of Charleston Harbor
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Second Battle of Charleston Harbor

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Second Battle of Charleston Harbor

The second battle of Charleston Harbor, also known as the siege of Charleston Harbor, the siege of Fort Wagner, or the battle of Morris Island, took place during the American Civil War in the late summer of 1863 between a combined U.S. Army/Navy force and the Confederate defenses of Charleston, South Carolina.

After being repulsed twice while trying to take Fort Wagner by storm, Maj. Gen. Quincy Adams Gillmore decided on a less costly approach and began laying siege to the fort.

In the days immediately following the second battle of Fort Wagner, Union forces besieged the Confederate works on Morris Island with an array of military novelties. Union gunners made use of a new piece of artillery known as the Requa gun—25 rifle barrels mounted on a field carriage. While sappers dug zig-zag trenches toward Fort Wagner a second novelty was used—the calcium floodlight. Bright lights were flashed upon the defenders, blinding them enough to decrease accurate return fire while the Union gunners fired safely from behind the lights

The Confederate defenders also had advantages. The ground the Union sappers were digging through was shallow sand with a muddy base. The trenching efforts also began to accidentally uncover Union dead from the previous assaults on Fort Wagner. Disease and bad water plagued soldiers on both sides.

The Union army maintained a constant rotation of soldiers to man the forward trenches of the "grand guard". During the evening of August 16, a Confederate artillery shell burst through the bombproof building serving as the headquarters for Colonel Joshua B. Howell, commanding officer of the grand guard that evening. A shell fragment struck Colonel Howell, wounding him severely in the head. Despite Howell's quick recovery, the incident prompted the Union commander to exclusively use veteran troops in the forward trenches. The Confederates also kept a constant rotation of soldiers through Fort Wagner and Battery Gregg. During the night, rowboats would bring fresh troops from the mainland to replace the garrison. Even though they had won a substantial victory at Fort Wagner, the Confederates fully expected the campaign to continue. Having a large garrison to draw from Gen. P.G.T. Beauregard was prepared to continue the campaign. Immediately in command of the Confederate forces surrounding Charleston was former career army officer and South Carolina businessman Roswell S. Ripley. Ripley's forces were spread throughout the fortifications surrounding Charleston Harbor and included a division of the local South Carolina militia. Gilmore and Admiral John A. Dahlgren requested reinforcements from General-in-Chief Henry Halleck. Halleck was reluctant but a division from the Army of the Potomac was transferred to the south under George H. Gordon. General John G. Foster, Union commander of the Department of North Carolina, enthusiastically sent a division of reinforcements telling Gilmore "Charleston is too important to be lost when so nearly won".

Despite the marshy conditions on Morris Island, Union forces had constructed powerful batteries to combat Fort Wagner. These batteries were often named in honor of fallen leaders such as Batteries Strong, Reynolds, Kearny and Weed. Others were named for high ranking army officers such as Batteries Rosecrans and Meade.

Inside Fort Wagner only one 10-inch Columbiad faced seaward and the few landward guns were in poor condition. During Colonel Lawrence M. Keitt's tenure in command of the Confederate garrison he established signal stations on Fort Wagner's west wall to coordinate with Confederate batteries on James Island. Keitt's replacement, General Johnson Hagood, made better use of sharpshooters and the few landward guns to impede the Union siege works upon the fort. The Confederates protected their own guns and bombproofs but exposed themselves to Union naval fire and in the end could only slow the Union trenches.

On August 2 under the direction of Colonel Edward W. Serrell, Union engineers began constructing a battery further inland with the intention of bombing the city of Charleston directly. By August 17 the massive battery was ready for its armament. Lieutenant Charles Sellmer with a detachment of the 11th Maine Infantry was called in to man the 200-pound Parrott rifle now being referred to as the "Swamp Angel". On August 21 Gilmore sent an ultimatum to Beauregard to abandon Forts Wagner and Sumter or Charleston would be fired upon. When Gilmore received no reply by the following day the first shot was fired from the Swamp Angel into Charleston using the steeple of St. Michael's Church for a bearing. On August 22 Confederate batteries tried in vain to silence the Swamp Angel. Beauregard scorned Gilmore for turning his guns on a civilian city and demanded an opportunity to evacuate citizens. Gilmore complied with a day of cease-fire but also took the opportunity to express the fact that Charleston was a legitimate military target as an ammunition supply. The firing resumed but on the 36th shot the Swamp Angel burst and was not replaced during the campaign. It was the first time a civilian population was deliberately targeted for military purposes during the Civil War.

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