On the 13th the fleet was pounding away at the earthworks again, the Ironsides being within one thousand yards of the northeast angle, and the monitors much closer, as they drew less water. The wind was off shore, and light, and the water smooth, or they could not have gone in so close, there being but a few inches of water under the keels of the ironclads. The fire was continued all that day, and at intervals during the night.

The fire of the ironclads was directed, during the whole of the second bombardment, at the land face of the main fort, where the assault by the troops was to be made; and although they were nearly concealed by the high traverses, which made an angle with the line of fire, it was seen that many guns were struck and disabled, but the full extent of the damage was not known till after the surrender. Then it was found that every gun on that face of the fort had been disabled, principally by the heavy shot and shell of the ironclads, which lay so near the fort, and fired deliberately, and in perfect security.

It was the northeastern face which was to be assaulted by the troops of General Terry. The sea front had been under the fire of the wooden ships, which had to lie further off, and their fire was less effective, and the face less injured. It was decided to assault this face with the sailors and marines of the fleet. There were seventeen guns on the land face, with immense hills for traverses, extending a third of a mile. The other face, that to be assaulted by the sailors and marines, was about one mile in length, terminating on the right flank in a mound fifty-three feet high, mounted with two very heavy guns.

The arrangement of guns and traverses was such that, in an assault, each would have to be taken separately.

On the morning of the 15th the ships went once more into position, and fired rapidly. The soldiers and sailors made arrangements for the assault; throwing up breastworks and rifle-pits towards the fort. From 11 A. M. to about half-past two, a tremendous fire was kept up, and the heavy embankments crumbled under the shot and shell, while more guns were disabled.

Still, the garrison, of about 2300 men, lay sheltered in their bomb-proofs, ready to come out and repel the assault as soon as the fire of the fleet should cease.

At half-past two the naval column was ready to advance, and the fire from the fleet, at a given signal, suddenly ceased, the quiet seeming quite unnatural after the continuous roar of artillery.

The naval column then moved along the beach, to assault the sea-face of the main work. This was defended by palisades, as was the land face, and was about forty feet high, and very steep—difficult for an armed man to climb.

As the fire from the fleet ceased, the garrison came out of the bomb-proofs, and, manning the parapet of the sea-face, began to shoot down the assaulting sailors and marines. Loaded pieces were handed up to those on the parapet, so the fire was very rapid. The beach was soon strewn with dead and wounded, many staggering into the water and falling there.

A few of the men, with many of the officers, reached the foot of the mound, but they could get no further, and the bulk of the naval force retreated down the beach again, entirely exposed, and losing heavily from the deliberate musketry fire of the garrison. Those who had reached a place of partial shelter, about the foot of the mound, were obliged to remain there until approaching darkness and hard fighting on the other face gave them an opportunity to get away. The loss in this attempted assault was very heavy, twenty-one officers of the navy having been killed or wounded, with a proportionate number of sailors and marines.