Tabular Statement of Casualties in the Army of the Potomac in the battles of South Mountain and Crampton's Pass, on the 14th of September, 1862.*

Tabular Report of Casualties in the Army of the Potomac in the battle of Antietam, on the 16th and 17th of September, 1862.

Casualties in the Army of the Potomac in the battle of Antietam, fo.-Continued.

Tabular Report of Casualties in Morell's division, Fifth Corps, in actions of 19th and 20th of September, 1862, near Shepherdstown, Va.

Statement of Casualties in the Army of the Potomac, September 3–20, 1862, inclusive.

NEW YORK, August 4, 1863. SIR: I have the honor to submit herein the official report of the operations of the Army of the Potomac while under my charge. Accompanying it are the reports of the corps, division, and subordinate commanders pertaining to the various engagements, battles, and occurrences of the campaigns, and important documents connected with its organization, supply, and movements. These, with lists of maps and memoranda submitted, will be found appended, duly arranged, and marked for convenient reference.*

FOURTH PERIOD.

On the 1st of September I went into Washington, where I had an interview with the General-in-Chief, who instructed me verbally to take command of its defenses, expressly limiting my jurisdiction to the works and their garrisons, and prohibiting me from exercising any control over the troops actively engaged in front under General Pope. During this interview I suggested to the General-in-Chief the necessity of his going in person or sending one of his personal staff to the army under General Pope for the purpose of ascertaining the exact condition of affairs. He sent Colonel Kelton, his assistant adjutant-general.

During the afternoon of the same day I received a message from the General-in-Chief to the effect that he desired me to go at once to his house to see the President.

Portions report here omitted are printed in Vols. V and XI of this series.

The President informed me that he had reason to believe that the Army of the Potomac was not cheerfully co-operating with and sup porting General Pope; that he had "always been a friend of mine," and now asked me, as a special favor, to use my influence in correcting this state of things. I replied, substantially, that I was confident that he was misinformed; that I was sure, whatever estimate the Army of the Potomac might entertain of General Pope, that they would obey his orders, support him to the fullest extent, and do their whole duty. The President, who was much moved, asked me to telegraph to "Fitz John Porter or some other of my friends," and try to do away with any feeling that might exist, adding that I could rectify the evil and that no one else could.

I thereupon told him that I would cheerfully telegraph to General Porter, or do anything else in my power to gratify his wishes and relieve his anxiety; upon which he thanked me very warmly, assured me that he could never forget my action in the matter, &c., and left.

I then wrote the following telegram to General Porter, which was sent to him by the General-in-Chief:

Major-General PORTER:

WASHINGTON, September 1, 1862.

I ask of you, for my sake, that of the country, and the old Army of the Potomac, that you and all my friends will lend the fullest and most cordial co-operation to General Pope in all the operations now going on. The destinies of our country, the honor of our arms, are at stake, and all depends now upon the cheerful co-operation of all in the field. This week is the crisis of our fate. Say the same thing to my friends in the Army of the Potomac, and that the last request I have to make of them is that for their country's sake they will extend to General Pope the same support they ever have to me.

I am in charge of the defenses of Washington, and am doing all I can to render your retreat safe should that become necessary.

To which he sent the following reply:

GEO. B. MCCLELLAN.

FAIRFAX COURT-HOUSE,

September 2, 1862-10 a. m.

General GEORGE B. MCCLELLAN,

Major-General, Commanding, Washington:

You may rest assured that all your friends, as well as every lover of his country, will ever give, as they have given, to General Pope their cordial co-operation and constant support in the execution of all orders and plans. Our killed, wounded, and enfeebled troops attest our devoted duty.

F. J. PORTER.

Neither at the time I wrote the telegram nor at any other time did I think for one moment that General Porter had been or would be in any manner derelict in the performance of his duty to the nation and its cause. Such an impression never entered my mind. The dispatch in question was written purely at the request of the President.

On the morning of the 2d the President and General Halleck came to my house, when the President informed me that Colonel Kelton had returned from the front; that our affairs were in a bad condition; that the army was in full retreat upon the defenses of Washington; the oads filled with stragglers, &c. He instructed me to take steps at once to stop and collect the stragglers, to place the works in a proper state of defense and to go out to meet and take command of the army when it approach ed the vicinity of the works; then to place the troops in the best position-committing everything to my hands.

I immediately took steps to carry out these orders, and sent an aide to General Pope with the following letter:

Maj. Gen. John Pope,

Commanding Army of Virginia :

HEADQUARTERS, Washington, September 2, 1862

GENERAL: General Halleck instructed me to repeat to you the order he sent this morning to withdraw your army to Washington without unnecessary delay. He feared that his messenger might miss you, and desired to take this double precaution. In order to bring troops upon ground with which they are already familiar, it would be best to move Porter's corps upon Upton's Hill, that it may occupy Hall's Hill, &c.; McDowell's to Upton's Hill; Franklin's to the works in front of Alexandria; Heintzelman's to the same vicinity; Couch to Fort Corcoran, or, if practicable. to the Chain Bridge; Sumner either to Fort Albany or to Alexandria, as may be most convenient.

In haste, general, very truly, yours,

GEO. B. MCCLELLAN,
Major-General, U. S. Army.

In the afternoon I crossed the Potomac and rode to the front, and at Upton's Hill met the advance of McDowell's corps, and with it Generals Pope and McDowell. After getting what information I could from them, I sent the few aides at my disposal to the left, to give instructions to the troops approaching in the direction of Alexandria, and, hearing artillery firing in the direction of the Vienna and Langley road, by which the corps of Sumner, Porter, and Sigel were returning, and learning from General Pope that Sumner was probably engaged, I went with a single aide and three orderlies by the shortest line to meet that column. I reached the column after dark, and proceeded as far as Lewinsville, where I became satisfied that the rear corps (Sumner's) would be able to reach its intended position without any serious molestation. I therefore indicated to Generals Porter and Sigel the positions they were to occupy, sent instructions to General Sumner, and at a late hour of the night returned to Washington.

Next day I rode to the front of Alexandria, and was engaged in rectifying the positions of the troops and giving orders necessary to secure the issuing of the necessary supplies, &c. I felt sure on this day that we could repulse any attack made by the enemy on the south side of the Potomac.

On the 3d the enemy had disappeared from the front of Washington, and the information which I received induced me to believe that he intended to cross the Upper Potomac into Maryland. This materially changed the aspect of affairs and enlarged the sphere of operations; for, in case of a crossing in force, an active campaign would be necessary to cover Baltimore, prevent the invasion of Pennsylvania, and clear Maryland. I therefore on the 3d ordered the Second and Twelfth Corps to Tennallytown, and the Ninth Corps to a point on the Seventh street road near Washington, and sent such cavalry as was available to the fords near Poolesville, to watch and impede the enemy in any attempt to cross in that vicinity.

On September 5 the Second and Twelfth Corps were moved to Rockville, and Couch's division (the only one of the Fourth Corps that had been brought from the Peninsula) to Offutt's Cross-Roads.

On the 6th the First and Ninth Corps were ordered to Leesborough; the Sixth Corps and Sykes' division of the Fifth Corps to Tennallytown. On the 7th the Sixth Corps was advanced to Rockville, to which place my headquarters were moved on the same day.

All the necessary arrangements for the defense of the city under the new condition of things had been made, and General Banks was left in command, having received his instructions from me.