Emilio describes the aftermath of the assault ( [BBR], pp.86-93):

Although the storming column and supports did not move forward with a close formation and promptness in support of the Fifty-fourth, which might have won Wagner that night, their attacks when made were delivered with a gallantry and persistence that made their severe losses the more deplorable and fruitless, by reason of such faulty generalship.

When Strong’s brigade advanced, it met the same devastating fire at the defile; but a considerable number of the survivors, mainly of the Sixth Connecticut and Forty-eighth New York, pushed on to the southeast bastion, feebly defended by the Thirty-first North Carolina, and entered, securing a portion of the salient. Farther they could not penetrate against superior numbers. General Strong accompanied his column, and, as always, exhibited the utmost bravery.

General Seymour, learning the failure of Strong’s brigade to carry the work, ordered Colonel Putnam to advance his regiments. That officer gallantly led forward his brigade, meeting the same severe fire as he neared the fort. With survivors of the Seventh New Hampshire, he entered the disputed salient, followed by portions of the Sixty-second and Sixty-seventh Ohio. His One Hundredth New York advanced to a point near the work, in the confusion and darkness poured a volley into our own men in the salient, and then retired. It must be understood, however, that all these regiments suffered severe losses; but losses that night do not necessarily indicate effective regimental action. The greatest number of men in the salient at any time hardly equalled a regiment, and were of different organizations. They were fighting in a place unknown to them, holding their ground and repelling attacks, but were incapable of aggressive action. Fighting over traverses and sand-bags, hemmed in by a fire poured across their rear, as well as from the front and flanks, the struggle went on pitilessly for nearly two hours. Vainly were precious lives freely offered up, in heroic attempts to encourage a charge on the flanking guns. The enveloping darkness covered all; and the valiant, seeing how impotent were their efforts, felt like crying with Ajax, ” Give us but light, 0 Jove! and in the light, if thou seest fit, destroy us! ”

Every field-officer in the bastion was at last struck down except Major Lewis Butler, Sixty-seventh Ohio. Colonel Putnam had been shot through the head. When all hope of expected support was gone, Major Butler sent out the regimental colors, and gave orders to leave the bastion.  There were, according to his account, about one hundred men each of the Sixty-second and Sixty-seventh Ohio, about fifty of the Forty-eighth New York, and some small detachments of other regiments, some with and some without officers. When this force had departed, and the enemy had been re-enforced by the arrival of the Thirty-second Georgia, the wounded, those who feared to encounter the enclosing fire, and those who failed to hear or obey the order for abandonment, were soon surrounded and captured. General Stevenson’s brigade had advanced toward the fort, but it was too late, and the men were withdrawn.

Upon the beach in front of the siege line, drunken soldiers of the regular artillery, with swords and pistol-shots, barred the passage of all to the rear. They would listen to no protestations that the regiments were driven back or broken up, and even brutally ordered wounded men to the front. After a time, their muddled senses came to them on seeing the host of arrivals, while the vigorous actions of a few determined officers who were prepared to enforce a free passage, made further opposition perilous.

Thus ended the great assault on Fort Wagner. It was the second and last attempted. The Confederate loss was 181 killed and wounded, including Lieut.-Col. J. C.  Simkins, Captains W. H. Ryan, W. T. Tatom, and P. H.  Waring, and Lieut. G. W. Thompson, killed. Our loss was 1,515, including 111 officers, and embracing General Seymour wounded, General Strong mortally wounded, and Colonel Putnam (acting brigadier) killed. Of the ten regimental commanders, Colonel Shaw was killed, Col.  J. L. Chatfield, Sixth Connecticut, mortally wounded, and five others wounded. Such severe casualties stamp the sanguinary character of the fighting, and mark the assault as one of the fiercest struggles of the war, considering the numbers engaged. This is further evidenced by the fact that the losses exceeded those sustained by our forces in many much better-known actions during the Rebellion, —notably Wilson’s Creek, Pea Ridge, Cedar Mountain, Chantilly, Prairie Grove, Pleasant Hills, Sailor’s Creek, Jonesborough, Bentonville, and High Bridge, in most of which a much larger Federal force was engaged.  The following is the official report of the part borne by the Fifty-fourth in the assault: —

HEADQUARTERS FIPTT-FOURTH MASS. VOLS.,

MORRIS ISLAND, S. C, NOV. 7, 1863.

BRIG.-GEN. T. SEYMOUR, Commanding U. S. Forces, Morris Island, S. C.

GENERAL, — In answer to your request that I furnish you with a report of the part taken by the Fifty-fourth Massachusetts Volunteers in the late assault upon Fort Wagner, I have to state: —

During the afternoon of the 18th of July last, the Fifty-fourth Massachusetts Volunteers, Col. R. G. Shaw commanding, landed upon Morris Island and reported at about six o’clock P.M. to Brig.-Gen. G. C. Strong. Colonel Shaw’s command present consisted of a lieutenant-colonel of the field, a surgeon, adjutant, and quartermaster of the staff, eight captains and eleven subaltern officers of the line and six hundred enlisted men. General Strong presented himself to the regiment, and informed the men of the contemplated assault upon Fort Wagner, and asked if they would lead it. They answered in the affirmative. The regiment was then formed in column by wing, at a point upon the beach a short distance in the advance of the Beacon house. Col. R. G. Shaw commanded the right wing, and Lieut.-Col. E. N. Hallowell the left.

In this formation, as the dusk of evening came on, the regiment advanced at quick time, leading the column. The enemy opened on us a brisk fire, our pace now gradually increasing till it became a run. Soon canister and musketry began to tell on us. With Colonel Shaw leading, the assault was commenced.  Exposed to the direct fire of canister and musketry, and, as the ramparts were mounted, to a like fire on our flanks, the havoc made in our ranks was very great.

Upon leaving the ditch for the parapet, they obstinately contested with the bayonet our advance. Notwithstanding these difficulties, the men succeeded in driving the enemy from most of their guns, many following the enemy into the fort. It was here upon the crest of the parapet that Colonel Shaw fell; here fell Captains Russel and Simpkins; here were also most of the officers wounded. The colors of the regiment reached the crest, and were there fought for by the enemy ; the State flag there torn from its staff, but the staff remains with us. Hand grenades were now added to the missiles directed against the men.

The fight raged here for about an hour, when, compelled to abandon the fort, the men formed a line about seven hundred yards from the fort, under the command of Capt. Luis F. Emilio, — the ninth captain in the line; the other captains were either killed or wounded. The regiment then held the front until relieved by the Tenth Connecticut at about two o’clock A. M.  of the 19th.

The assault was made upon the south face of the fort. So many of the officers behaved with marked coolness and bravery, I cannot mention any above the others. It is due, however, to the following-named enlisted men that they be recorded above their fellows for especial merit: —

Sergt. Robt. J. Simmons ……………………………………………Co. B.
Sergt. William H. Carney …………………………………………..Co. C.
Corp. Henry F. Peal ………………………………………………….Co. F.
Pvt. Geo. Wilson ………………………………………………………Co. A.

The following is the list of casualties: —
Officers.

Col. R. G. Shaw…………………………………………………………killed
Lieut.-Col. E. N. Hallowell……………………………………..wounded
Adjt. G. W. James…………………………………………………wounded
Capt. S. Willard…………………………………………………….wounded
Capt. C. J. Russel…………………….missing, supposed to be killed
Capt. W. H. Simpkins……………….missing, supposed to be killed
Capt. Geo. Pope……………………………………………………wounded
Capt. E. L. Jones…………………………………………………..wounded
Capt. J. W. M. Appleton………………………………………….wounded
Capt. O. E. Smith…………………………………………………..wounded
1st Lieut. R. H. L. Jewett………………………………………….wounded
1st Lieut. Wm. H. Homans……………………………………….wounded
2d Lieut. C. E. Tucker……………………………………………..wounded
2d Lieut. J. A. Pratt…………………………………………………wounded

Enlisted Men.

Killed………………………………………………………………………………9
Wounded………………………………………………………………………147
Missing…………………………………………………………………………100
Total…………………………………………………………………………….256

I have the honor to be, very respectfully,
Your obedient servant,
E. N. HALLOWELL,
Colonel Commanding Fifty-fourth Massachusetts Volunteers.

Lieutenant Howard, in falling back from the fort, with a few men he had gathered, retired directly down the beach, not encountering the larger part of the regiment.  Lieut. T. L. Appleton retired first but a short distance, where, in the sand-hills, he found General Strong with some detachments which he was urging to advance.  Lieutenant Appleton moved forward again a short distance, but finding there was no concerted advance, went rearward. Sergeant Swails of Company F was with Captains Simpkins and Russel under the left bastion. They climbed the parapet, and were at once fired upon. Captain Russel fell wounded, and Simpkins asked him if he would be carried off. When he declined, and asked to lie straightened out, Simpkins directed Swails to help him do this, and while kneeling over his friend’s head, facing the enemy, was himself hit. Putting his hand to his breast, he fell across Russel, and never spoke or moved again. Swails, who relates this, says he was soon asked by Russel to change his position, that he (Swails) might not draw the Rebel fire on the wounded, and did so. Frank Myers, of Company K, whose arm was shattered, states that he stood under the uplifted arm of Colonel Shaw, while that officer was on the parapet, waving his sword, and crying, ” Forward, Fifty-fourth! ” He saw the colonel suddenly fall, and was struck himself a moment after. Thomas Burgess, of Company I, makes a similar statement.

Capt. J. W. M. Appleton, at the curtain, hearing firing at last on the right, climbed with Captain Jones and Lieutenant Emerson into the southeast bastion, and joined in the desperate fighting there. Captain Appleton was finally badly wounded, and made his way out with great difficulty, to report the situation in the bastion. Captain Jones was also severely wounded. He fell into the moat, where he remained until assisted rearward by George Remsley of Company C. Lieutenant Emerson in the bastion used the musket he had picked up before the curtain. To protect the wounded lying near he pulled out sand-bags. When a volunteer was wanted to report their situation to some general officer, he offered himself, saying, ” I will go, but if I am killed, just tell them I did not run away! ” As he was still able to fight, Captain Appleton, who was disabled, went instead. Lieutenant Homans was wounded near the fort, and thought himself mortally hurt, as he was spitting blood, but staggered along until he was met by Lieutenant Dexter, who assisted him to the rear.

Sergt. George E. Stephens of Company B, in a letter to the writer[Emilio], says,—

” I remember distinctly that when our column had charged the fort, passed the half-filled moat, and mounted to the parapet, many of our men clambered over, and some entered by the large embrasure in which one of the big guns was mounted, the firing substantially ceased there by the beach, and the Rebel musketry fire steadily grew hotter on our left. An officer of our regiment called out, ‘ Spike that gun!’ . . . Just at the very hottest moment of the struggle, a battalion or regiment charged up to the moat, halted, and did not attempt to cross it and join us, but from their position commenced to fire upon us.  I was one of the men who shouted from where I stood, ‘ Don’t fire on us! We are the Fifty-fourth.’ I have heard it was a Maine regiment. . . . Many of our men will join me in saying that in the early stages of the fight we had possession of the sea end of Battery Wagner. . . . When we reached the Gatling battery drawn up to repel a counter-attack, I remember you were the only commissioned officer present, and you placed us indiscriminately, — that is, without any regard to companies in line, — and proposed to renew the charge. The commanding officer, whom I do not know, ordered us to the flanking rifle-pits, and we then awaited the expected counter-charge the enemy did not make.”

Lieutenant Smith, severely wounded, remained on the field until the next day, when he was brought in. Lieutenant Pratt, wounded in two places, concealed himself in the marsh. There he remained many hours, until at last, braving the fire of Rebel pickets, he escaped into our lines.

First Sergeant Simmons of Company B was the finest-looking soldier in the Fifty-fourth, — a brave man and of good education. He was wounded and captured.  Taken to Charleston, his bearing impressed even his captors. After suffering amputation of the arm, he died there.