With the fort practically left alone during the months immediately following, the garrison gradually restored order from chaos. The parade ground, excavated well below high-water level to provide sand-filling, was cleared, drained, and partially rebuilt. Trim ranks of gabions (wicker baskets filled with sand) bolstered the sloping debris of the walls on the interior. The three-gun battery in the lower right face was lined with logs and planks, 10 feet deep, and revetted more thoroughly in the rear. In casemates of the left flank another three-gun battery was created. Through the disordered debris of the left and right faces, the garrison tunneled a 275-foot timbered gallery connecting the two batteries and fort headquarters in the left flank. In from the rubble of the “sea front,” the garrison built a loopholed timber blockhouse to cover the parade ground in the event of further assault. In May, Capt. John C. Mitchel, son of the Irish patriot, relieved Lt. Col. Stephen Elliott in command. _The Third Great Bombardment_ The onset of summer, 1864, brought one more attempt to take Fort Sumter; likewise another officer of the original Fort Sumter garrison came into the operation. Maj. Gen. J. G. Foster, engineer of the fort in April 1861, succeeding to Gillmore’s command on May 26, was convinced that “with proper arrangements” the fort could easily be taken “at any time.” The “proper arrangements” included special light-draft steamers and 1,000-man “assaulting arks” equipped with elevated towers for sharpshooters and 51-foot scaling ladders. Though initial War Department reaction was cool, Foster went ahead with a preliminary operation to complete the demolition of the fort. “Yankee ingenuity” might succeed where routine operations had failed or been judged too costly. [Illustration: “Fort Sumter: Interior Sunrise, December 9, 1864” painted by Conrad Wise Chapman. Courtesy Confederate Museum, Richmond.] On July 7, 1864, Foster’s batteries opened a sustained bombardment against the ruin of Fort Sumter. During the remainder of that month, an average of 350 rounds daily was hurled at the beleagured fort. In some respects, this was the heaviest bombardment Fort Sumter had yet received. Although the gorge ruin was wasted away at one point to within 20 feet of the water, and the shattered “sea front” was still further reduced, the right face remained erect, its three-gun battery intact, likewise most of the left flank. To Admiral Dahlgren, as late as July 21, the work seemed “nearly impregnable.” Debris added to debris, feverish work day and night, and thousands of bags of sand brought from the city by night actually made the fort stronger than ever. If a casemate were breached, it was speedily filled; if the slopes of the ruin invited assault, a bristling array of wooden pikes and barbed-wire entanglements were provided; and there were always the muskets of the 300-man garrison.