The work was difficult. The granite of the foundation, for example, was laid between high and low watermarks, and there were periods of time when the tide permitted no work to be done at all. Yellow fever was a recurrent problem; so was the excessive heat of the Charleston summers. Much of the building material had to be brought in from the north. The magnitude of the task is indicated by the quantities involved: about 10,000 tons of granite (some of it from as far away as the Penobscot River region in Maine) and well over 60,000 tons of other rock. Bricks, shells, and sand could be obtained locally, but even here there were problems. Local brickyard capacities were small and millions of bricks were required. Similarly, hundreds of thousands of bushels of shells were needed—for concrete, for the foundation of the first-tier casemate floors, and for use in the parade fill next to the enrockment. Even the actual delivery of supplies, however local in origin, was a problem, for then, as now, Fort Sumter was a difficult spot at which to land. Fort Sumter in December 1860 was a five-sided brick masonry fort designed for three tiers of guns. Its 5-foot-thick outer walls, towering nearly 50 feet above low water, enclosed a parade ground of roughly 1 acre. Along four of the walls extended two tiers of arched gunrooms. Officers’ quarters lined the fifth side—the 316.7-foot gorge. This wall was to be armed only along the parapet. Three-story brick barracks for the enlisted garrison paralleled the gunrooms on each flank. At the center of the gorge was the sally port. It opened on the 25½-foot-wide stone esplanade that extended the length of that wall and on a 171-foot wharf. [Illustration: Spiking the guns at Fort Moultrie, just prior to departure for Fort Sumter, December 26, 1860. From Frank Leslie’s Illustrated Newspaper, January 5, 1861.] Fort Sumter was unfinished when, late in December, gathering events prompted its occupation by artillery troops. Eight-foot-square openings yawned in place of gun embrasures on the second tier. Of the 135 guns planned for the gunrooms and the open terreplein above, only 15 had been mounted. Most of these were “32 pounders”; none was heavier. Various details of the interior finish of barracks, quarters, and gunrooms were incomplete. Congressional economies had had their effect, as much as difficulties of construction. As late as 1858 and 1859, work had been virtually at a standstill for lack of funds. _Major Anderson Moves Garrison from Moultrie to Sumter_ On December 20, 1860, South Carolina seceded from the Union. On the night of the 26th, fearing attack by the excited populace, Maj. Robert Anderson removed the small garrison he commanded at Fort Moultrie to Fort Sumter out in the harbor. Ignorant of an apparent pledge to maintain the harbor _status quo_, given by President Buchanan some weeks before, Anderson moved in accordance with instructions received December 11, which read: