The two rear gunboats, the Kineo and Wissahickon, were both delayed in passing; the Kineo by a collision with the Brooklyn, the two vessels meeting between the hulks, and the Wissahickon by fouling the obstructions. The difficulty of finding the breach was already felt, and became more and more puzzling as the vessels were nearer the rear. The Wissahickon was one of the last that succeeded in getting through.

The port column was under way in time to follow close in the wake of its predecessor; indeed, it seems certain that, in impatience to be off, or from some other reason, the leading ships of this division doubled on the rear ships of the van. By the report of the captain of the Hartford, which led, that ship was engaged only twenty minutes after the enemy opened on the leading vessels of the starboard column. She steered in near to Jackson, but a fire raft coming down on her caused her to sheer across the river, where she took the ground close under St. Philip; the raft lying on her port quarter, against which it was pushed by the tug Mosher,[6] a small affair of thirty-five tons, unarmed, with a crew of half a dozen men commanded by a man named Sherman. On that eventful night, when so many hundreds of brave men, each busy in his own sphere, were plying their work of death, surely no one deed of more desperate courage was done than that of this little band. The assault threatened the very life of the big ship, and was made in the bright light of the fire under the muzzles of her guns. These were turned on the puny foe, which received a shot in her boilers and sunk. It is believed that the crew lost their lives, but the Hartford had caught fire and was ablaze, the flames darting up the rigging and bursting through the ports; but the discipline of her crew prevailed over the fury of the element, while they were still receiving and returning the blows of their human antagonists in both forts; then working herself clear, the Hartford passed from under their fire.

The Brooklyn and Richmond followed the Hartford, and behind them the gunboat division Sciota, Iroquois, Pinola, Kennebec, Itasca, and Winona, Fleet-Captain Bell having his divisional flag flying on board the Sciota. By this the enemy had better range, and at the same time the smoke of the battle was settling down upon the face of the river. The good fortune which carried through all the vessels of the leading column therefore failed the rear. The Brooklyn lost sight of her next ahead and, as she was passing through the hulks, using both broadsides as they would bear, came violently into collision with the Kineo, next to the last ship of the starboard column—another indication that the two columns were lapping. The gunboat heeled violently over and nearly drove ashore; but the two vessels then went clear, the Brooklyn fouling the booms of the eastern hulks, breaking through them but losing her way. This caused her to fall off broadside to the stream, in which position she received a heavy fire from St. Philip. Getting clear and her head once more up river, the Manassas, which had been lying unseen close to the east bank, came butting into the starboard gangway. The blow was delivered with slight momentum against the chain armor, and appeared at the time to have done little damage; but subsequent examination showed that the Brooklyn's side was stove in about six feet below the water-line, the prow having entered between the frames and crushed both inner and outer planking. A little more would have sunk her, and, as it was, a covering of heavy plank had to be bolted over the wound for a length of twenty-five feet before she was allowed to go outside. At the same time that the Manassas rammed she fired her single gun, the shot lodging in the sand bags protecting the steam-drum. Groping on by the flash of the guns and the light of the burning rafts, the Brooklyn, just clearing a thirteen-foot shoal, found herself close under St. Philip, from whose exposed barbette guns the gunners fled at her withering fire, as they had from that of the Pensacola.

The Richmond, a slow ship at all times, was detained by her boilers foaming, and was much separated from her leaders. Still she engaged Fort Jackson and passed through the fire with small loss. The little Sciota followed with equal good fortune, having but two men wounded.

The Pinola, which had taken her place next to the Iroquois, was not so fortunate. She engaged first Fort Jackson, from whose fire she received little injury. Then she passed over to the other side within one hundred and fifty yards of St. Philip, from which she at first escaped with equal impunity; but coming then within the light of the fire-rafts, and the greater part of the squadron having passed, the enemy were able to play upon her with little to mar their aim. She was struck fourteen times, and lost three killed and eight wounded, the heaviest list of casualties among the gunboats.

The Iroquois, which was on picket duty, fell into her station behind the Sciota as the fleet went by. After passing through the obstructions, and when already some distance up the stream, as the current round the bend was throwing her bow off and setting her over on the east bank, the order "starboard" was given to the wheel. As too often happens, this was understood as "stop her," and the engines were stopped while the wheel was not moved. In consequence of this mistake the Iroquois, then a very fast ship, shot over to the east (at this point more precisely the north) bank, past the guns of St. Philip, and brought up against the ironclad steamer Louisiana that was lying against the levee a short distance above the fort. This powerful, though immovable, vessel at once opened her ports and gave the Iroquois every gun that would bear, and at the same time a number of her people ran on deck as though to repel what seemed to be an attempt to board. This gave the Iroquois an opportunity of returning the murderous fire she had received, which she did with effect. Some of the guns of the Louisiana had been double-shotted, the second shot being in two cases found sticking in the hole made by the first. This unfortunate collision made the loss of the Iroquois amount to 8 killed and 24 wounded, in proportion to her complement the heaviest of the whole fleet. It was as she slowly drew away that Commander Porter noted her as "lingering," standing out in full relief against the light of the burning rafts; then she went her way, the last to pass, and the fight was won.

The three gunboats at the rear of the second column failed to get by. The Itasca, on coming abreast of Fort Jackson, was pierced by several shot, one of them entering the boiler. The steam issuing in a dense cloud drove every one up from below, and the vessel deprived of her motive power, drifted helplessly down the stream. The Winona following her, fouled the obstructions, and before she could get clear the Itasca backed on board of her. After a half hour's delay she proceeded under a heavy fire, at first from Jackson. Thinking the burning raft, in whose light the Pinola suffered, to be on that side of the river, she tried to pass on the St. Philip side, receiving the fire of the latter fort at less than point-blank range. Shooting over to the other side again, so thick was the smoke that the ship got close to shore, and her head had to be turned down stream to avoid running on it. By this time day had broken, and the Winona, standing out against the morning sky, under the fire of both forts, and with no other vessel to distract their attention, was forced to retire. The Kennebec also fouled the rafts and was unable to get by before the day dawned.

The steamers of the mortar flotilla, and the sailing sloop Portsmouth, as soon as the flag-ship had lifted her anchor, moved up into the station which had been assigned them to cover the passage of the fleet, about five hundred yards from Jackson, in position to enfilade the water battery commanding the approach to the fort. The vessels kept their place, firing shrapnel and shell, until the last of the fleet was seen to pass the forts. They then retired, the mortar-schooners at the same time ceasing from the shelling, which had been carried on throughout the engagement.

An hour and a quarter had elapsed from the time that the Cayuga passed the obstructions. The fleet, arriving above the forts, fell in with the Confederate flotilla, but in the absence of the Louisiana the other Confederate steamers were no match for their antagonists. The Cayuga indeed, dashing forward at a rate which left her but fifteen minutes under the fire of the forts, found herself when above them in hot quarters; and in a not unequal match rendered a good account of three assailants. The Varuna, passing with yet greater rapidity, steamed through with her guns trained as far ahead as they could be, and delivered her fire as opportunity offered. She soon passed beyond them, unsupported, and continued up the river, coming close upon a steamer called the Doubloon, in which were General Lovell and some of his staff, who narrowly escaped being captured. After the Varuna came the Governor Moore, which had been down among the Union fleet, receiving there the fire of the Oneida and Pinola. Finding the berth too hot for him, and catching sight of the Varuna thus separated from her fleet, Kennon hoisted the same lights as the latter vessel and followed on up. The lights deceived the Varuna and also the Confederate steamer Jackson, which had been up the river on duty and was at quarantine as the two others drew near. Taking them for enemies the Jackson opened a long-range fire on the two impartially, one of her shots wounding the fore-mast of the Moore; she then steamed hastily away to New Orleans, where she was destroyed by her commander. The only other vessel in sight was the Stonewall Jackson[7] of the River Defence Fleet, carrying one gun. She was behind the two, trying to escape unseen to New Orleans. Kennon now opened fire, hoping that the Jackson, undeceived, would turn back to help him, but she kept on her upward course; the Varuna, however, was no longer in ignorance. Finding that the height of the Moore's forecastle out of water and the position of the bow gun would not let it be depressed enough to fire with effect, Kennon resorted to the old-time heroic treatment for such defects; loading the gun with percussion shell he fired it through the bows of his own ship, and used the hole thus made for a port. The next shot raked the Varuna's deck, killing three and wounding nine of the crew. Boggs then put his helm hard aport, bringing his starboard battery to bear and doubtless expecting that the enemy would follow his motion to avoid being raked, but Kennon knew too well his own broadside weakness, and keeping straight on ran into the Varuna before her head could be gotten off again. The powerful battery of the Union vessel, sweeping from stem to stem, killed or wounded a large part of the enemy's crew; but her own fate was sealed, her frame being too light for such an encounter. The Moore having rammed again then hauled off, believing the Varuna to be in a sinking condition, and tried to continue up stream, but with difficulty, having lost her wheel-ropes. The Stonewall Jackson, now coming up, turned also upon the Varuna and rammed her on the port side, receiving a broadside in return. The Union vessel then shoved her bow into the east bank and sank to her top-gallant forecastle.

The Varuna's advance had been so rapid that there seems to have been some uncertainty in the minds of Captains Bailey and Lee of the Cayuga and Oneida as to where she was. It being yet dark they were very properly inclined to wait for the rest of the fleet to come up. In a few moments, however, the Oneida moved slowly ahead as far as quarantine, whence the Varuna and her enemies were made out. The Oneida then went ahead at full speed. When she came up the Varuna was already ashore, her two opponents trying to escape, but in vain. The Stonewall Jackson ran ashore without offering resistance, on the right bank nearly opposite the Varuna; the Moore on the left bank, some distance above, where her captain set her on fire, but received the broadsides of the Oneida and Pensacola with his colors still flying, and so was taken.