Organized at Baltimore and Williamsport, Md., June 18, 1861, to February 17, 1862. Companies "A," "B," "C," "D" and "H" organized at Baltimore August, 1861, to February 16, 1862. 4 Companies organized at Williamsport in summer of 1861; assigned as Companies "A," "B," "C" and "I." Original Companies "A," "B," "C" and "D" designated Companies "D," "E," "F" and "G." Companies "E," "F," "H" and "I" broken up May 11, 1862, and distributed among Companies "A," "B," "C," "D" and "G." 2 Companies recruited for 4th Maryland Infantry and assigned as Companies "E" and "H." 2 Companies recruited for Dix's Light Infantry and assigned as Companies "I" and "K." Company "F" organized October 15, 1862, at Euston, Md., for 9 months; assigned February, 1863, and mustered out September 2, 1863.
Regiment attached to Dix's Division, Baltimore, Md., to May, 1862. 1st Brigade, Sigel's Division, Dept. of the Shenandoah, to June, 1862. 2nd Brigade, 2nd Division, 2nd Corps, Pope's Army of Virginia, to August, 1862. 1st Brigade, 2nd Division, 2nd Army Corps, Army of Virginia, to September, 1862. 2nd Brigade, 2nd Division, 12th Army Corps, Army of the Potomac, to October, 1862. 2nd Brigade, 1st Division, 12th Army Corps, to May, 1863. 1st Brigade, 1st Division, 12th Army Corps, Army of the Potomac, to September, 1863, and Army of the Cumberland to April, 1864. (1st Brigade, 1st Division, 20th Army Corps, Army of the Cumberland, April to October, 1864. Non-Veterans.) Regiment, 2nd Brigade, 1st Division, 9th Army Corps, Army of the Potomac, April to June 1, 1864. 1st Brigade, 1st Division, 9th Army Corps, to July, 1864. 2nd Brigade, 1st Division, 9th Army Corps, to September, 1864. 3rd Brigade, 1st Division, 9th Army Corps, to July, 1865.
Regiment lost during service 8 Officers and 83 Enlisted men killed and mortally wounded and 4 Officers and 130 Enlisted men by disease. Total 225.
SERVICE.-Duty at Baltimore, Md., till May 24, 1862. Moved to Harper's Ferry, W. Va., May 24. Defence of Harper's Ferry May 28-30. Operations in the Shenandoah Valley till August. Battle of Cedar Mountain August 9. Pope's Campaign in Northern Virginia August 16-September 2. Fords of the Rappahannock August 21-23. Sulphur Springs August 24. Plains of Manassas August 28-29 (Reserve). Battle of Bull Run August 30 (Reserve). Maryland Campaign September 6-22. Battle of Antietam , Md., September 16-17. Duty at Bolivar Heights September 22 to December 10. Reconnoissance to Rippon, W. Va., November 9. Expedition to Winchester December 2-6. Moved to Fredericksburg December 10-14. At Stafford's Court House December 14, 1862, to April 27, 1863. "Mud March" January 20-24, 1863. Chancellorsville Campaign April 27-May 6. Battle of Chancellorsville May 1-5. Gettysburg (Pa.) Campaign June 11-July 24. Battle of Gettysburg July 1-3. Pursuit of Lee July 5-24. At Raccoon Ford till September. Moved to Brandy Station, thence to Bealeton and to Stevenson, Ala., September 24-October 4. Guard duty on Nashville & Chattanooga Railroad till April, 1864. Veterans on furlough March and April. Old members participated in Atlanta (Ga.) Campaign May 1 to September 8, 1864. Demonstration on Rocky Faced Ridge May 8-11. Battle of Resaca May 14-15. Near Cassville May 19. Advance on Dallas May 22-25. New Hope Church May 25. Battles about Dallas , New Hope Church and Allatoona Hills May 26-June 5. Operations about Marietta and against Kenesaw Mountain June 10-July 2. Pine Mountain June 11-14. Lost Mountain June 15-17. Gilgal or Golgotha Church June 15. Muddy Creek June 17. Noyes Creek June 19. Kolb's Farm June 22. Assault on Kenesaw June 27. Ruff’s Station , Smyrna Camp Ground, July 4. Chattahoochie River July 5-17. Peach Tree Creek July 19-20. Siege of Atlanta July 22-August 25. Operations at Chattahoochie River Bridge August 26-September 2. Occupation of Atlanta September 2. Regiment joined 9th Army Corps, Army of the Potomac, April, 1864. Campaign from the Rapidan to the James May 3-June 15. Battles of the Wilderness May 5-7; Spottsylvania May 8-12; Nye River May 10; Spottsylvania Court House May 12-21. Assault on Salient May 12. Ox Ford May 21. North Anna River May 23-26. 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. Mine Explosion, Petersburg, July 30, 1864. Weldon Railroad August 18-21. Poplar Grove Church September 29-October 2. Boydton Plank Road , Hatcher's Run, October 27-28. Fort Steadman , Petersburg, March 25, 1865. Appomattox Campaign March 28-April 9. Assault on and fall of Petersburg April 2. Occupation of Petersburg April 3. March to Farmville April 3-9. Moved to Petersburg and City Point April 20-24, thence to Alexandria April 26-28. Grand Review May 23. Duty in the Dept. of Washington till July. Mustered out July 31, 1865.
