Gillmore ordered his siege guns and mortars to begin a bombardment of the fort on July 18 and they were joined by the naval gunfire from six
monitors that pulled to within 300 yards of the fort. The bombardment lasted eight hours, but caused little damage against the sandy walls of the fort, and in all, killed only about 8 men and wounded an additional 20, as the defenders had taken cover in the bombproof shelter. The
54th Massachusetts, an infantry regiment composed of
African-American soldiers led by Colonel
Robert Gould Shaw, led the Union attack at dusk. They were backed by two brigades composed of nine regiments. The first brigade was commanded by General
George Crockett Strong and was composed of the 54th Massachusetts, 6th Connecticut, 48th New York,
3rd New Hampshire, 76th Pennsylvania, and the
9th Maine regiments. The second brigade was commanded by Colonel
Haldimand S. Putnam of the 7th New Hampshire as acting brigade commander. His brigade consisted of the 7th New Hampshire,
62nd Ohio,
67th Ohio, and the 100th New York regiments. A third brigade, under General Stevenson, was in reserve, with General
Truman Seymour commanding on the field, but not entering action. The assault began at 7:45 p.m. and was conducted in three movements. The 54th Massachusetts attacked to the west upon the curtain of Wagner, with the remainder of General Strong's brigade and
Colonel Putnam's brigade attacking the seaward salient on the south face. As the assault commenced and bombardment subsided, the men of the 1st South Carolina Artillery, Charleston Battalion, and 51st North Carolina Infantry took their positions. The 31st North Carolina, which had been completely captured during the
battle of Roanoke Island and later exchanged, remained in the bombproof shelter and did not take its position in the southeast bastion. When the 54th Massachusetts reached about 150 yards from the fort, the defenders opened up with cannon and small arms, tearing through their ranks. The 51st North Carolina delivered a direct fire into them, as the Charleston Battalion fired into their left. The 54th managed to reach the
parapet, but after a fierce struggle, including hand-to-hand combat, they were forced back. The 6th Connecticut continued the assault at the weakest point, the southeast, where the 31st had failed to take its position. General Taliaferro quickly rounded up some soldiers to take the position, while the 51st North Carolina and Charleston Battalion fired obliquely into the assailants. Behind the 6th Connecticut, the 48th New York also successfully reached the slopes of the bastion. The remainder of Strong's brigade did not reach that far, as three of the defending howitzers were now in action and firing canister into their flanks, bringing them to a halt. Colonel Putnam quickly brought up his brigade, but only about 100 or 200 men from the 62nd and 67th Ohio reached the bastion. The Confederates attempted to counter-attack twice, but were beaten back after having the officers leading the charge shot down. As the Union assault continued to crumble, due to lack of reinforcements from General Stevenson, Taliaferro was reinforced by the 32nd Georgia Infantry, which had been transported to the island by Brigadier General
Johnson Hagood. The fresh troops swept over the bastion, killing or capturing the rest of the Union troops that remained. By 10:00 p.m. the bloody struggle had concluded with heavy losses. General
George Crockett Strong was mortally wounded in the thigh by grape shot while trying to rally his men. Colonel
Haldimand S. Putnam was shot in the head and killed in the salient while giving the order to withdraw. Colonel
John Lyman Chatfield of the 6th Connecticut was mortally wounded. The 54th Massachusetts's colonel,
Robert Gould Shaw, was killed upon the parapet early in the action. Some Confederate reports claim his body was pierced seven times, with the fatal wound a rifle bullet to his chest. Sergeant Major
Lewis Henry Douglass, son of the famous orator
Frederick Douglass, survived the battle and wrote about it in a letter to his future wife. ==Aftermath==