The Second Battle of Fort Sumter was fought on September 8, 1863, in Charleston Harbor. Confederate General P. G. T. Beauregard, who had commanded the defenses of Charleston and captured Fort Sumter in the first battle of the war, was in overall command of the defenders. In the battle, Union forces under Major General Quincy Gillmore attempted to retake the fort at the mouth of the harbor. Union gunners pummeled the fort from their batteries on Morris Island. After a severe bombing of the fort, Beauregard, suspecting an attack, replaced the artillerymen and all but one of the fort's guns with 320 infantrymen, who repulsed the naval landing party. Gillmore had reduced Fort Sumter to a pile of rubble, but the Confederate flag still waved over the ruins.

USS New Ironsides was a wooden-hulled broadside ironclad built for the United States Navy during the American Civil War. The ship spent most of her career blockading the Confederate ports of Charleston, South Carolina, and Wilmington, North Carolina, in 1863–65. New Ironsides bombarded the fortifications defending Charleston in 1863 during the First and Second Battles of Charleston Harbor. At the end of 1864 and the beginning of 1865 she bombarded the defenses of Wilmington in the First and Second Battles of Fort Fisher.