|February 26||Organized at Washington, D.C. under the command of Colonel Isaac A. Peck and Lieutenant Colonel Charles M. Alexander|
|March||Attached to Military District of Washington, D.C. for duty in the Defenses of Washington and Alexandria|
|June 7||Colonel Peck resigned|
|June 12||Lieutenant Colonel Alexander was promoted to colonel|
Attached temporarily to 2nd Brigade, 1st Division, 5th Army Corps, Army of the Potomac.
The regiment was in reserve and not engaged.
|September 19||Sharpsburg, Shepherdstown Ford and near Williamsport|
|September 20||Near Shepherdstown|
|October||Returned to duty in the Defenses of Washington and Alexandria|
|December||Colonel Alexander took command of Tyler’s Division|
|March||Assigned to 1st Brigade, Tyler’s Division, 22nd Army Corps, which was commanded by Colonel Alexander|
|May||Assigned to District of Alexandria, 22nd Army Corps|
|February 16||Colonel Alexander mustered out. Colonel William Graham took command of the regiment|
|September 12||Mustered out|