To guard against a simultaneous attack from many sides, against which sixty men could make only a feeble defence, mines were planted under the wharf where a landing was most feasible, to blow it up at the proper time. Piles of paving stones with charges of powder under them, to scatter them as deadly missiles among an attacking party, were placed on the esplanade. Metal-lined boxes were placed on the parapet on all sides of the fort, from which musketry-fire and hand-grenades could be thrown down on the invaders directly beneath. Barrels filled {13} with broken stone, with charges of powder at the centre, were prepared to roll down to the water's edge and there burst. A trial of this device was observed by the rebels, who inferred from it that Sumter was bristling with "infernal machines" and had better be dealt with at long range. [Illustration: HARPER'S FERRY.] The discomforts and sufferings of the garrison were very great. Quarters were lacking in accommodations; rations were short, and fuel was scanty in midwinter. The transition from the position of friends to that of foes was not immediate, but gradual. After the move to Sumter, the men were still permitted to do their marketing in Charleston; for all that Anderson had then done was to make a displeasing change of base in a harbor where he commanded, and could go where he pleased. Presently market privileges were restricted, and then prohibited altogether; and even when, under the expectation of action at Washington satisfactory to the South, the authorities relaxed their prohibition, the secessionist marketmen would sell nothing to go to the fort. Constant work on salt pork, with limited necessaries and an entire absence of luxuries, made the condition of the garrison very hard, and their conduct worthy of the highest praise.