position, where they were least exposed to the guns of the works. Immediately after the submission of the castle Farragut went ashore to examine and note the effects of the fire, and especially of the horizontal shell fire; which was then so much a novelty in naval warfare that he speaks of the missiles continuously as shell-shot, apparently to distinguish them from the vertically thrown bombs. "Now it was seen for the first time that the material of which Ulloa is built (soft coral) was the worst substance in the world for protection against the modern shell. The French threw almost entirely shell-shot, which entered the wall twelve or eighteen inches and then exploded, tearing out great masses of stone, and in some instances rending the wall from base to top. The damage done by these shell-shot was inconceivably greater than that by the shell from the bomb-vessels, owing to the former striking horizontally, while the latter fell vertically upon the bomb-proofs, doing but little damage.... I am satisfied of one fact--viz., that they might have bombarded with the bomb-vessels for a month without success, while the frigates would in four hours more, with their shell-shot, have reduced the fort to a heap of ruins." This opinion as to the inefficacy of bomb-firing to destroy a work anticipated the experience of the Civil War, where the conclusion was that it might wear out the endurance of the garrison by constant harassment, but not directly reduce the works themselves. It is only just to say that his estimate of the effect of the horizontal fire upon the walls is more favorable than that of the French engineers, who did not consider that the damage done necessarily entailed a capitulation; but seamen and engineers have rarely agreed in their opinions upon this subject.