Third Brigade.

Colonel WILLIAM R. PEASE.

5th New York Heavy Artillery (Battalion), Major G. F. Merriam.

10th New York Heavy Artillery, Colonel Alex. Piper.

117th New York (Battalion), Colonel William R. Pease.

CORPS OF OBSERVATION.*

Colonel A. B. JEWETT.

23rd Maine, Colonel William Wirt Virgin.

39th Massachusetts, Colonel P. S. Davis.

14th New Hampshire, Colonel Robert Wilson.

10th Vermont, Lieutenant Colonel William W. Henry.

6th Michigan Cavalry, Companies I and M, Captain Charles W. Deane.

11th New York Cavalry, Companies E, F, and I, Leiut. Colonel S. H. Wilkerson.

10th Massachusetts Battery, Captain J. Henry Sleeper.

RAILWAY BRIGADE.+

109th New York, Colonel B. F. Tracy.

FORT WASHINGTON.

Colonel CHARLES S. MERCHANT.

16th Indiana Battery, Lieutenant Charles R. Deming.

4th U. S. Artillery (headquarters).

Abstract from return of the Middle Department, Major General Robert C. Schenck, U. S. Army, commanding, for March 31, 1863; headquarters, Baltimore, Md.

Present for duty.

Command. Officers. Men. Aggregate

present.

Department staff 22 ---- 22

First Division (Kelley) 563 12,198 14,945

Second Division (Milroy) 386 7,775 9,596

First Separate Brigade 123 2,255 2,592

Second Separate Brigade 102 2,275 2,941

Third Separate Brigade 156 2,925 3,679

Fourth Separate Brigade (no ---- ---- ----

report)

Annapolis 30 491 583

Philadelphia 11 173 237

Fort Delaware 18 558 722

Camp Chesebrough 3 97 185

Total 1,417 28,747 35,502

Pieces of artillery.

Command. Aggregate Aggrega-te last Heavy. Field.

present and return.

absent.

Department staff 22 36 ---- ----

First Division 16,560 19,215 25 38

(Kelley)

Second Division 11,323 5,696 ---- 20

(Milroy)

First Separate Brigade 2,838 2,098 ---- ----

Second Separate 3,311 3,394 ---- ----

Brigade

Third Separate Brigade 4,087 4,251 ---- ----

Fourth Separate ---- ---- ---- ----

Brigade (no report)

Annapolis 636 713 ---- ----

Philadelphia 275 263 ---- ----

Fort Delaware 747 549 67 6

Camp Chesebrough 347 342 ---- ----

Total 40,146 36,557 92 64

RECORD OF EVENTS.

From the 1st to the 11th March, Brigadier General B. F. Kelley commanded the troops in and around Harper's Ferry, Va., and the Defenses of the Upper Potomac and the line of the Baltimore and Ohio Railroad. On the 11th March, he was relieved of this command, and assigned to the command of the Third Division, transferring his headquarters to Cumberland, Md. March 16, Brigadier-General Kelley assumed command of

---------------

*At Edwards Ferry, Poolesville, and White's Ford.

+Headquarters at Annapolis, Md.

---------------