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 Gen. 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 Col. 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 Gen. Stevenson was in reserve, with General Truman Seymour commanding on the field, but did not enter action.