Warren was ordered to push rapidly on the left of the enemy. Sheridan promptly opened battle, but he was hard pressed throughout the day. Warren, for some not satisfactorily explained cause, did not arrive on the field and bring his three infantry divisions into action until late in the day, but yet in time to strike the enemy on his left and rear, as had been planned. Just at night a combined assault of all arms completely overthrew Pickett and Fitz Lee, taking six of their guns, thirteen battle-flags, and nearly six thousand prisoners. The Confederates who escaped were cut off from the remainder of Lee's army and thrown back on the upper Appomattox.

Warren, in the full flush of the victory, was, by Sheridan, with Grant's previous authority, relieved on the battle-field from the command of his corps for the alleged dilatory march to the relief of the imperilled cavalry. Warren had long commanded the Fifth Corps, and was beloved by it. But the fates of war were inexorable. The removal of Warren was perhaps unjust, in the light of the previous conduct of the war. He had not been insubordinate. He had imbibed the notion too often theretofore acted on, that in the execution of an important order, even when other movements depended on it, the subordinate officer could properly exercise his own discretion as to the time and manner of its execution. Warren was a skilled engineer officer and held too closely in an emergency to purely scientific principles. He had none of Sheridan's precipitancy, and did not believe in violating, under any circumstances, principles of war taught by the books. Before a subsequent court of inquiry Warren produced what appeared to be overwhelming testimony from experienced and distinguished officers of the army to the effect that he had moved his corps to Five Forks with the energy and celerity usually exhibited by an officer of ordinary skill and ability.

Sheridan was called as a witness before the same court, and when interrogated, corroborated the other officers' testimony, adding, that it was not an officer of ordinary skill and ability that was required to meet an emergency when a battle was on, but one of extraordinary skill and ability; that officers of the former class were plenty, but they were not fit to command an army corps in time of battle. Sheridan wanted an officer like Desaix, who, by putting his ear to the ground, heard the thunder of the guns at Marengo, though far off, and marched to their sound without awaiting orders, and to the relief of Napoleon, arriving in time to turn defeat into victory, though losing his own life. Warren had many friends and sympathizers, but he died many years after the war of a broken heart.

In anticipation of Sheridan's success, orders were issued for the Sixth Corps to assault Lee's main fortifications on Sunday morning, April 2d. The place selected for the assault was in front and a little to the left of Forts Fisher and Welch and directly opposite the intrenched line taken by me on March 25th.( 5) Other corps to the right of the Sixth were ordered to be ready to assault also. It was originally intended the troops should be formed in the quiet of the night, and that the assault should be made, as a surprise, at four o'clock in the morning. Grant, fearing that Lee, in the desperation of defeat at Five Forks, would strip his fortified lines of troops to overwhelm and destroy Sheridan, now fairly on Lee's right flank, at 10 P.M. on the night of the 1st ordered all his guns turned loose from the James to the Union left, to give the appearance of a readiness to do just what had been ordered to be done. This fire brought a return fire all along the lines. The night was dark and dismal, and the scene witnessed amid the deafening roar of cannon was indescribably wild and grand. Duty called some of us between the lines of cross-fire when the screaming shot and bursting shell from perhaps four hundred heavy guns passed over our heads. The world's war-history described no sublimer display. Being near the end of the Rebellion, the Confederacy, and the institution of slavery, it was a fitting closing scene. It was supposed that in consequence of this artillery duel, which lasted about two hours, the assault ordered would be abandoned, as a surprise was not possible. But at 12, midnight, the order came to take position for the attack. The Sixth Corps, in the gloom of the damp, chilly night, silently left its winter quarters and filed out to an allotted position within about two hundred yards of the mouths of the enemy's cannon, there to await the discharge of a gun from Fort Fisher, the signal for storming the works. There were no light hearts in the corps that night, but there were few faint ones. The soldiers of the corps knew the strength and character of the works to be assailed. They had watched their completion; they knew of the existence of the abattis and the deep ditches to be passed, as well as the high ramparts to be scaled. The night added to the solemnity of the preparation for the bloody work.

The Second Division was formed on the right, the Third Division on the left, each in two lines of battle, about two hundred feet apart. The First Division (Wheaton's) was in echelon by brigades, in support on Getty's right.( 6) The corps was formed on ground lower than that on which the enemy's fortifications were constructed. There was an angle in the enemy's line in front of the corps as formed at which there was a large fort. Getty's division was to assault to the right and Seymour's to the left of this fort. My brigade was to assault between it and the fort about a third of a mile to its left. The connecting breastworks were strong, as has been explained, with a deep ditch and formidable abattis in their front, and well manned and supplied with artillery. The enemy was alert and opened fire on us with artillery and musketry before we were completely formed, inflicting some loss. Long before the hour for the signal the corps was ready. Much preparation is necessary for a well delivered assault. Every officer should be personally instructed as to his particular duties, as commands can rarely be given after the troops are in motion. The pioneer corps with axe- men were required to accompany the head of the column, to cut down and remove obstructions and to aid the soldiers in crossing trenches and scaling the works. The abattis was to be cut down or torn up, and, wherever possible, used in the ditches to provide means of crossing them.

A narrow opening, just wide enough for a wagon to pass through, was known to exist in the enemy's line in front of my brigade, though it was skillfully covered by a shoulder around it. The existence of this opening was discovered from the observation tower, and deserters told of it. I determined to take advantage of it, and therefore instructed Colonel Clifton K. Prentiss of the 6th Maryland when the time for the attack came to move his regiment by the flank rapidly through this opening without halting or firing, and when within, open on the Confederates behind the works, taking them in flank, and, if possible, drive them out and thus leave for our other troops little resistance in gaining an entrance over the ramparts.

At 4.40 A.M., while still dark, a gray light in the east being barely discernible, Fort Fisher boomed forth a single shot. All suspense here ended. Simultaneously the command, "Forward," was given by all our officers, and the storming column moved promptly; the advance line, with bayonets fixed, guns not loaded, the other line with guns loaded to be ready to fire, if necessary, to protect those in advance while passing the trenches. A few only of the officers were on horseback. The enemy opened with musketry and cannon, but the column went on, sweeping down the abattis, making use of it to aid in effecting a passage of the deep ditches and to gain a footing on the berme of the earthworks. Muskets and bayonets were also utilized by thrusting them into the banks of the ditches to enable the soldiers to climb from them. Men made ladders of themselves by standing one upon another, thus enabling their comrades to gain the parapets. The time occupied in the assault was short. Colonel Prentiss with his Marylanders penetrated the fortifications at the opening mentioned. They surprised the enemy by their presence and a flank fire, and, as anticipated, caused him to fall back. The storming bodies swarmed over the works, and the enemy immediately in their front were soon killed, wounded, captured, or dispersed. Ten pieces of artillery, three battle-flags, and General Heth's headquarters flag were trophies of my command. The Third Division gained an entrance first, owing to the shortness of the distance it had to pass over. Getty's division (Second), however, promptly obtained a foothold within the fortifications to the right of the angle, followed on its right closely by Wheaton's division. The fort at the salient angle was quickly evacuated, and the corps charged forward, taking possession of the enemy's camps. Some hand- to-hand fighting occurred on the ramparts of the fortifications and in the camps, in which valuable lives were lost. A Confederate soldier emerged from a tent, shot and killed Captain Henry H. Stevens (110th Ohio), and immediately offered to surrender. One week before a like incident occurred in my presence, where a Confederate officer shot, with a pistol, a Union soldier, then threw down his arms and proposed to surrender. Officers seldom restrained soldiers from avenging, on the spot, such cowardly and unsoldierly acts. Such incidents were, happily, very rare.

Though thus far the assault had been crowned with success, the greatest danger was still before us. Experience had taught that the fate which one week before befell Gordon at Fort Stedman was a common fate of troops who, in a necessarily broken state, gained an entrance inside of an energetic enemy's lines. Our position was not dissimilar to Gordon's after he had taken Fort Stedman. To our left was a strong, closed star-fort, well manned and supplied with cannon. It was impossible at once to restore order. Many of our men passed, without orders, far to the north, some as far as the Southside Railroad leading into Petersburg, which they began to tear up.

One important incident must be mentioned.

Corporal John W. Mouk (138th Pennsylvania), with one comrade, having penetrated in the early morning some distance in advance of our other troops, was met by a Confederate general officer, accompanied by his staff. The general demanded his surrender, whereupon the corporal fired and killed him. He proved to be Lieutenant-General A. P. Hill, then in command of Lee's right wing, and one of the ablest officers the Confederacy produced. The corporal and his comrade escaped, and Hill's staff bore his body away. It has been claimed the corporal deceived Hill by pretending to surrender until the General was in his power, then shot him. I investigated this incident at the time and became convinced the corporal practised no deception, and that his deliberate conduct—natural to him—led Hill and his staff to assume he intended to surrender.