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WILLIAMS'S DIVISION.

ordnance guns ;

Artillery.-Best's battery F, 4th United States, 6 Napoleon guns; Hampton's battery, Maryland, 4 10-pounder Parrott guns; Thompson's battery, Maryland, 4 10-pounder Parrott guns; Mathews's battery F, Pennsylvania, 6 3-inch

battery M, 1st New York, 6 10-pounder Parrott guns; Knapp's battery, Pennsylvania, 6 10-pounder Parrott guns; McMahon’s battery, New York, 6 3-inch ordnance guns.

Infantry.Abercrombie's brigade : 12th and 2d Massachusetts, and 16th Indiana, 1st Potomac home brigade, (Maryland,)1 company Zouaves D’Afrique, (Pennsylvania) volunteers. brigade: 9th New York State militia, and 29th. Pennsylvania, 29th Indiana, and 3d Wisconsin volunteers.

brigade: 28th New York, 5th Connecticut, 46th Pennsylvania, 1st Maryland, 12th Indiana, and 13th Massachusetts volunteers.

SHIELDS'S DIVISION.

Artillery.Clark's battery E, 4th United States, 6 10-pounder Parrott guns; Jenks's battery A, 1st Virginia, 4 10-pounder Parrott and 2 6-pounder guns; Davy's battery B, 1st Virginia, 2 10-pounder Parrott guns; Huntington's battery A, 1st Ohio, 6 13-pounder James's guns; Robinson's battery L, 1st Ohio, 2 12-pounder howitzers and 4 6-pounder guns; and

battery, 4th Ohio artillery. Infantry

brigade: 14th Indiana, 4th, 8th, and 67th Ohio, 7th Virginia, and 84th Pennsylvania volunteers.

brigade: 5th, 62d, and 66th Ohio, 13th Indiana, and 39th Illinois volunteers.

brigade: 7th and 29th Ohio, 7th Indiana, 1st Virginia, and 11th Pennsylvania volunteers. Andrew sharpshooters.

GENERAL WADSWORTH'S COMMAND.

Cavalry.1st New Jersey cavalry, at Alexandria, and 4th Pennsylvania cavalry, east of the Capitol.

Artillery and infantry.10th New Jersey volunteers, Bladensburg road; 104th New York volunteers, Kalorama heights; 1st Wisconsin heavy artillery, Fort Cass, Virginia; 3 batteries of New York artillery, Forts Ethan Allen and Marcy; depot of New York light artillery, Camp Barry; 2d District of Columbia volunteers, Washington city ; 26th Pennsylvania volunteers, G street wharf; 26th New York volunteers, Fort Lyon; 95th New York volunteers, Camp Thomas ; 94th New York and detachment of 88th Pennsylvania volunteers, Alexandria; 91st Pennsylvania volunteers, Franklin Square barracks ; 4th New York artillery, Forts Carroll and Greble; 112th Pennsylvania volunteers, Fort Saratoga ; 76th New York volunteers, Fort Massachusetts ; 59th New York volunteers, Fort Pennsylvania ; detachment of 88th Pennsylvania volunteers, Fort Good Hope ; 99th Pennsylvania volunteers, Fort Mahon; 2d New York light artillery, Forts Ward, Worth, and Blenker; 107th and 54th Pennsylvania volunteers, Kendall Green; Dickerson's light artillery, 86th New York, and detachment of 88th Pennsylvania volunteers, east of the Capitol; 14th Massachusetts (volunteers) heavy artillery and 56th Pennsylvania volunteers, Forts Albany, Tillinghast, Richardson, Runyon, Jackson, Barnard, Craig, and Scott; detachments of 4th United States artillery and 37th New York volunteers, Fort Washington ; 97th, 101st, and 91st New York, and 12th Virginia volunteers, Fort Corcoran.

In camp near Washington.-6th and 10th New York, Swain's New York, and 2d Pennsylvania cavalry, all dismounted.

These troops (3,359 men) were ordered to report to Colonel Miles, commanding railroad guard, to relieve 3,306 older troops ordered to be sent to Manassas to report to General Abercrombie.

GENERAL DIX'S COMMAND, BALTIMORE.

Cavalry.—1st Maryland cavalry and detachment of Purnell Legion cavalry.

Artillery.--Battery 1, 2d United States; battery -, Maryland; battery L, 1st New York, and two independent batteries of Pennsylvania artillery.

Infantry.-3d and 4th New York, 11th, 87th, and 111th Pennsylvania, detachment 21st Massachusetts, 2d Delaware, 2d Maryland, 1st and 2d Eastern Shore (Maryland) home guards, and Purnell Legion (two battalions) Maryland volunteers.

In a staff charged with labors so various and important as that of the army of the Potomac, a chief was indispensable to supervise the various departments and to relieve the commanding general of details. The officer of chief of staff, well known in European armies, had not been considered necessary in our small peace establishment. The functions of the office were not defined, and, so far as exercised, had been included in the Adjutant General's department. The small number of officers in this department, and the necessity for their employment in other duties, have obliged commanding generals, during this war, to resort to other branches of the service to furnish suitable chiefs of staff.

On the 4th of September, 1861, I appointed Colonel R. B. Marcy, of the inspector general's department, chief of staff, and he entered upon service immediately, discharging the various and important duties with great fidelity, industry, and ability, from this period until I was removed from command at Rectortown. Many improvements have been made during the war in our system of staff administration, but much remains to be done.

Our own experience, and that of other armies, agree in determining the necessity for an efficient and able staff. To obtain this, our staff establishment should be based on correct principles, and extended to be adequate to the necessities of the service, and should include a system of staff and line education.

The affairs of the Adjutant General's department, while I commanded the army of the Potomac, were conducted by Brigadier General S. Williams, sisted by Lieutenant Colonel James A. Hardie, aide-de-camp. Their management of the department during the organization of the army in the fall and winter of 1861, and during its subsequent operations in the field, was excellent.

They were, during the entire period, assisted by Captain Richard B. Irwin, aide-de-camp, and during the organization of the army by the following-named officers: Captains Joseph Kirkland, Arthur McClellan, M. T. McMahon, William P. Mason, and William F. Biddle, aides-de-camp.

My personal staff, when we embarked for the Peninsula, consisted of Colonel Thomas M. Key, additional aide-de-camp; Colonel E. H. Wright, additional aide-de-camp and major, 6th United States cavalry; Colonel T. T. Gantt, additional aide-de-camp; Colonel J. J. Astor, jr., volunteer aide-de-camp; Lieutenant Colonel A. V. Colburn, additional aide-de-camp and captain, Adjutant General's department; Lieutenant Colonel N. B. Sweitzer, additional aide-decamp and captain, 1st United States cavalry; Lieutenant Colonel Edward McK. Hudson, additional aide-de-camp and captain, 14th United States infantry; Lieutenant Colonel Paul Von Radowitz, additional aide-de-camp; Major H. Von Hammerstein, additional aide-de-camp; Major W. W. Russell, United States marine corps ; Major F. LeCompte, of the Swiss army, volunteer aidede-camp; Captains Joseph Kirkland, Arthur McClellan, L. P. D'Orleans, R. D'Orleans, M. T. McMahon, William P. Mason, jr., William F. Biddle, and E. A. Raymond, additional aides-de-camp.

To this number I am tempted to add the Prince de Joinville, who constantly

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accompanied me through the trying campaign of the Peninsula, and frequently rendered important services. Of these officers Captain McMahon was assigned to the personal staff of Brigadier General Franklin, and Captains Kirkland and Mason to that of Brigadier General F. J. Porter during the siege of Yorktown. They remained subsequently with those general officers. Major LeCompte left the army during the siege of Yorktown; Colonels Gantt and Astor, Major Russell, Captains L.P.D’Orleans, R. D’Orleans, and Raymond at the close of the Peninsula campaign. Before its termination Captains W. S. Abert and Charles R. Lowell, of the 6th United States cavalry, joined my staff as aides-de-camp, and remained with me until I was relieved from the command of the army of the Potomac. All of these officers served me with great gallantry and devotion; they were ever ready to execute any service, no matter how dangerous, difficult, or fatiguing

ENGINEERS.

When I assumed command of the army of the Potomac I found Major J. G. Barnard, United States engineers, subsequently brigadier general of volunteers, occupying the position of chief engineer of that army. I continued him in the same office, and at once gave the necessary instructions for the completion of the defences of the capital, and for the entire reorganization of the department.

Under his direction the entire system of defences was carried into execution. This was completed before the army departed for Fort Monroe, and is a sufficient evidence of the skill of the engineers and the diligent labor of the troops.

For some months after the organization of the army of the Potomac was commenced there were no engineer troops with it. At length, however, three companies were assigned. Under the skilful management of Captain J. C. Duane, United States engineers, these new companies rapidly became efficient, and, as will be seen, rendered most valuable service during the ensuing campaigns.

The number of engineer troops being entirely inadequate to the necessities of the army, an effort was made to partially remedy this defect by detailing the 15th and 50th New York volunteers, which contained many sailors and mechanics, as engineer troops. They were first placed under the immediate superintendence of Lieutenant Colonel B. S. Alexander, United States engineers, by whom they were instructed in the duties of pontoniers, and became somewhat familiar with those of sappers and miners. Previous to the movement of the army for the Peninsula this brigade was placed under the command of Brigadier General D. P. Woodbury, major United States engineers.

The labor of preparing the engineer and bridge trains devolved chiefly upon Captain Duane, who was instructed to procure the new model French bridge train, as I was satisfied that the India-rubber pontoon was entirely useless for the general purposes of a campaign.

The engineer department presented the following complete organization when the moved for the Peninsula :

Brigadier General J. G. Barnard, chief engineer; First Lieutenant H. C. Abbott, topographical engineers, aide-de-camp. Brigade volunteer engineers, Brigadier General Woodbury commanding : 15th New York volunteers, Colonel McLeod Murphy; 50th New York volunteers, Colonel C. B. Stewart. Battalion, three companies United States engineers, Captain J. C. Duane commanding; companies respectively commanded by First Lieutenants C. B. Reese, c. E. Cross, and 0. E. Babcock, United States engineers. The chief engineer was ably assisted in his duties by Lieutenant Colonel B. S. Alexander, and First Lieutenants C. R. Comstock, M. D. McAlester, and Merrill, United States engineers. Captain C. S. Stuart and Second Lieutenant F. U. Farquhar, United States engineers, joined after the army arrived at Fort Monroe.

The necessary bridge equipage for the operations of a large army had been

army

collected, consisting of bateaux with the anchors and flooring material, (French model,) trestles, and engineers’ tools, with the necessary wagons for their transportation.

The small number of officers of this corps available rendered it impracticable to detail engineers permanently at the headquarters of corps and divisions. The companies of regular engineers never had their proper number of officers, and it was necessary, as a rule, to follow the principle of detailing engineer officers temporarily whenever their services were required.

TOPOGRAPHICAL ENGINEERS.

To the corps of topographical engineers was intrusted the collection of topographical information and the preparation of campaign maps. Until a short time previous to the departure of the army for Fort Monroe, Lieutenant Colonel John W. Macomb was in charge of this department, and prepared a large amount of valuable material. He was succeeded by Brigadier General A. A. Humphreys, who retained the position throughout the Peninsula campaign. These officers were assisted by Lieutenants H. L. Abbott, 0. G. Wagner, N. Bowen, John M. Wilson, and James H. Wilson, topographical engineers. This number, being the greatest available, was so small that much of the duty of the department devolved upon parties furnished by Professor Bache, Superintendent of the Coast Survey, and other gentlemen from civil life.

Owing to the entire absence of reliable topographical maps, the labors of this corps were difficult and arduous in the extreme. Notwithstanding the energy and ability displayed by General Humphreys, Lieutenant Colonel Macomb, and their subordinates, who frequently obtained the necessary information under fire, the movements of the army were sometimes unavoidably delayed by the difficulty of obtaining knowledge of the country in advance. The result of their labors has been the preparation of an excellent series of maps, which will be invaluable to any army traversing the same ground.

During the campaign it was impossible to draw a distinct line of demarcation between the duties of the two corps of engineers so that the labors of reconnoissances of roads, of lines of intrenchments, of fields for battle, and of the position of the enemy, as well as the construction of siege and defensive works, were habitually performed by details from either corps, as the convenience of the service demanded.

I desire to express my high appreciation of the skill, gallantry, and devotion displayed by the officers of both corps of engineers, under the most trying circumstances.

During Maryland campaign I united the two corps under Captain J. C. Duane, United States engineers, and found great advantages from the arrangement.

MEDICAL DEPARTMENT.

For the operations of the medical department I refer to the reports, transmitted herewith, of Surgeon Charles S. Tripler and Surgeon Jonathan Letterman, who, in turn, performed the duties of medical director of the army of the Potomac, the former from August 12, 1861, until July 1, 1862, and the latter after that date. The difficulties to be overcome in organizing and making effective the medical department were very great, arising principally from the inexperience of the regimental medical officers, many of whom were physicians taken suddenly from civil life, who, according to Surgeon Tripler, "had to be instructed in their duties from the very alphabet,” and from the ignorance of the line officers as to their relations with the medical officers, which gave rise to confusion and conflict of authority. Boards of examination were instituted, by which many ignorant officers were removed; and by the successive exertions of Surgeons Tripler and Letterman, the medical corps was brought to a very high

degree of efficiency. With regard to the sanitary condition of the army while on the Potomac, Dr. Tripler says that the records show a constantly increasing immunity from disease. “ In October and November, 1861, with an army averaging 130,000 men, we had 7,932 cases of fever of all sorts; of these, about 1,000 were reported as cases of typhoid fever. I know that errors of diagnosis were frequently committed, and therefore this must be considered as the limit of typhoid cases. If any army in the world can show such a record as this, I do not know when or where it was assembled." From September, 1861, to February, 1862, while the army was increasing, the number of sick decreased from 7 per cent. to 6.18 per cent. Of these, the men sick in the regimental and general hospitals were less than one-half; the remainder were slight cases, under treatment in quarters. “During this time, so far as rumor was concerned, the army was being decimated by disease every month." Of the sanitary condition of the army during the Peninsula campaign, up to its arrival at Harrison's landing, Dr. Tripler says: “During this campaign the army was favored with excellent health. No epidemic disease appeared. Those scourges of modern armies--dysentery, tupus, cholera-were almost unknown. We had some typhoid fever and more malarial fevers, but even these never prevailed to such an extent as to create any alarm. The sick reports were sometimes larger than we cared to have them; but the great majority of the cases reported were such as did not threaten life or permanent disability. I regret that I have not before me the retained copies of the monthly reports, so that I might give accurate statistics. I have endeavored to recover them, but have been unsuccessful. My recollection is, that the whole sick report never exceeded 8 per cent. of the force, and this including all sorts of cases, the trivial as well as the severe.

The
army

of the Potomac must be conceded to have been the most healthy army in the service of the United States.”

His remarks at the conclusion of his report upon our system of medical administration, and his suggestions for its improvement, are especially worthy of attention.

The service, labors, and privations of the troops during the seven days' battles had, of course, a great effect on the health of the army after it reached Harrison's landing, increasing the number of sick to about 20 per cent. of the whole force.

The nature of the military operations had also unavoidably placed the medical department in a very unsatisfactory condition. Supplies had been almost entirely exhausted or necessarily abandoned; hospital tents abandoned or destroyed, and the medical officers deficient in numbers and broken down by fatigue.

All the remarkable energy and ability of Surgeon Letterman were required to restore the efficiency of his department; but before we left Harrison's landing he had succeeded in fitting it out thoroughly with the supplies it required, and the health of the army was vastly improved by the sanitary measures which were enforced at his suggestion.

The great haste with which the army was removed from the Peninsula made it necessary to leave at Fort Monroe, to be forwarded afterwards, nearly all the baggage and transportation, including medical stores and ambulances, all the vessels being required to transport the troops themselves and their ammunition; and when the army of the Potomac returned to Washington after General Pope's campaign, and the medical department came once more under Surgeon Letterman's control, he found it in a deplorable condition. The officers were worn out by the labors they had performed, and the few supplies that had been brought from the Peninsula had been exhausted or abandoned, so that the work of reorganization and resupplying had to be again performed, and this while the army was moving rapidly, and almost in the face of the enemy. That it was successfully accomplished is shown by the care and attention which the wounded received after the battles of South Mountain and Antietam.

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