Organized at Baltimore, Md., and mustered in: Company "A" May 10; Companies "B," "C," May 11; Company "D," May 16, 1861. Moved to Relay House, Md. May 24, 1861. Company "E" mustered in May 25, and Companies "F," "G," "H," "I" and "K" mustered in at Relay House May 27, 1861. Camp at Relay House, on Baltimore & Ohio Railroad till June 6. Moved to Camp Carroll, near Baltimore, June 6; thence to Frederick City, Md., June 7. March to Middletown and Downsville July 7-10, and to Williamsport July 23. Duty guarding fords and ferries of Upper Potomac, from Williamsport to mouth of Antietam, till October 16. Attached to Defences Upper Potomac, Dept. of the Shenandoah, to October, 1861. Gordon's Brigade, Banks' Division, Army of the Potomac, to March, 1862. 1st Brigade, 1st Division, Banks' 5th Army Corps, to April, 1862. 1st Brigade, 1st Division, Dept. of the Shenandoah, to June, 1862. Baltimore, Md., Middle Dept., to September, 1862. Maryland Brigade, Defences Upper Potomac. Middle Dept., to March, 1863. 1st Brigade, 1st Division, 8th Army Corps, to June, 1863. Maryland Brigade, French's Division, 8th Army Corps, to July, 1863. 3rd Brigade, 3rd Division, 1st Army Corps, Army of the Potomac, to December, 1863. 2nd Brigade, 3rd Division, 1st Army Corps, to March, 1864. 3rd Brigade, 2nd Division, 5th Army Corps, to June, 1864. 2nd Brigade, 2nd Division, 5th Army Corps, to July, 1865.

SERVICE:
Action at Shepherdstown, Md., September 3, 1861 (Cos. "E," "G"). March to Darnestown October 16-19. Operations at Conrad's and Edwards' Ferries October 21-26. At Darnestown till December 2. March to Frederick City December 2, thence to Williamsport, Md., December 18, and guard crossing Upper Potomac till January 7, 1862. (Cos. "B," "C," "E" and "G" at Four Locks. Co. "F" at Dam No. 5; then at Four Locks. Co. "A" at Cherry Run, Co. "H" at Old Fort Frederick Cos. "I" and "K" near Fogal's Ferry.) Operations about Dams Nos. 4 and 5 December 17-20, 1861. Skirmishes at Old Fort Frederick December 25 (Co. "H"). Cherry Run December 25 (Co. "A"). Dam No. 5 December 25 (Co. "F"). Forced march to relief of Hancock, Md., January 7. 1862. Duty on Upper Potomac till February 28, 1862 (Cos. "A," "B," "C" and "G" at Millstone Point, "D" at Old Fort Frederick, "F" at Four Locks, "H" at Cherry Run, "I" at Bevan's Hill, "K" at Licking Creek Bridge, and "C" at Baer's School House. March to Williamsport February 28-March 1. Advance on Winchester March 2-12. Skirmish at Bunker Hill March 5. Near Winchester March 8 and 11. Occupation of Winchester March 12. March to Castleman's Ferry and return March 22-23. (Co. "B" detached at Winchester and in battle of March 23.) Pursuit of Jackson to Strasburg March 23-25. Reconnoissance toward Columbia Furnace April 9. Pursuit of Jackson April 17-25. Harrisonburg April 22. March to Strasburg May 1-9. Moved to Front Royal May 16. Operations in the Shenandoah Valley May 16-June 17. Action at Front Royal May 23, mostly captured. Middletown May 24 (Detachment). Winchester May 25(Detachment). Company "E" at Linden Station. Retreat to Manassas Junction May 23-28; thence moved to Baltimore, Md., and duty there till September. Prisoner's exchanged August, 1862. Regiment reorganized at Baltimore and duty there till September 18. Moved to the Antietam September 18. Defence of Williamsport September 20-21. Duty between Williamsport and Hagerstown till December 11. Moved to Maryland Heights December 11-12, and duty there till April 9, 1863. At Bolivar Heights till April 30. Moved to Grafton and Clarksburg, W. Va., to repel Rebel invansion April 30-May 1. Operations against Jones and Imboden May 1-26. Return to Maryland Heights May 26;, and duty there till June 30. Retreat to Frederick, Md., and guard bridges over the Monocacy till July 6. Recapture of Maryland Heights July 7. Joined 1st Army Corps near Boonsboro July 10. Pursuit of Lee to Warrenton, Va., July 10-24. Funkstown, Md., July 12-13. At Warrenton Junction July 25-27. Duty near Rappahannock Station August 4 to September 16. Advance to the Rapidan September 16-18. Bristoe Campaign October 9-22. Bristoe Station October 14. Haymarket October 19. Guard Orange and Alexandria R. R. October 24-November 23. Mine Run Campaign November 26-December 2. Near Culpeper till May, 1864. Demonstration on the Rapidan February 6-7. Veterans on furlough April and May. Campaign from the Rapidan to the James May 4-June 15. Battles of the Wilderness May 5-7. Laurel Hill May 8. Spottsylvania May 8-12. Spottsylvania Court House May 12-21. "Bloody Angle" May 12. Non-Veterans left front for muster out May 19, 1864. Mustered out May 28, 1864. Harris Farm, Fredericksburg Road, May 19. North Anna River May 23-26. Jericho Ford May 23. On line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Bethesda Church June 1-3. Before Petersburg June 16-18. Siege of Petersburg June 16, 1864, to April 2, 1865. Jerusalem Plank Road June 22-23, 1864. Mine Explosion Explosion, Petersburg, July 30 (Reserve). Weldon Railroad August 18-21. Poplar Springs Church September 29-October 2. Yellow House October 2-5. Peeble's Farm November 7-8. Hatcher's Run October 27-28. Warren's Raid on Weldon R. R. December 7-12. Dabney's Mills, Hatcher's Run, February 5-7, 1865. Appomattox Campaign March 28-April 9. Lewis Farm, near Gravelly Run, March 29. White Oak Road March 31. Five Forks April 1. Fall of Petersburg April 2. Pursuit of Lee, Appomattox Court House, April 9. Surrender of Lee and his army. March to Washington, D. C., May 1-12. Grand Review May 23. Camp at Arlington Heights, Va., till July. Mustered out July 2, 1865.

Regiment lost during service 8 Officers and 110 Enlisted men killed and mortally wounded and 1 Officer and 148 Enlisted men by disease. Total 267.