The 99th Regiment Pennsylvania Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.
The 99th Pennsylvania Infantry was organized at Philadelphia, Pennsylvania July 26, 1861, through January 18, 1862, as the 32nd Pennsylvania Infantry (not to be confused with the 3rd Pennsylvania Reserves/32nd Pennsylvania Infantry). Three companies moved to Washington, DC on August 8, 1861, and the regiment was eventually mustered in for a three-year enlistment under the command of Colonel Thomas Sweeney. The regimental designation was officially changed in February 1862.
The regiment was attached to Defenses of Washington, D.C., to October 1861. Jameson's Brigade, Heintzelman's Division, Army of the Potomac, to February 1862. Military District of Washington to June 1862. 3rd Brigade, 3rd Division, III Corps, Army of the Potomac, to August 1863. 3rd Brigade, 1st Division, III Corps, to December 1862. 2nd Brigade, 1st Division, III Corps, to August 1868. 3rd Brigade, 1st Division, III Corps, to October 1863. 2nd Brigade, 1st Division, III Corps, to March 1864. 1st Brigade, 3rd Division, II Corps, to July 1865.
The 99th Pennsylvania Infantry mustered out July 1, 1865.
Duty in the defenses of Washington, D.C., until June 29, 1862. Moved to Harrison's Landing June 29-July 4, and duty there until August 16. Movement to Fortress Monroe, then to Centreville August 16âÂÂ26. Pope's Campaign in northern Virginia August 26-September 2. Battle of Groveton August 29. Second Battle of Bull Run August 30. Battle of Chantilly September 1. Duty in the Defenses of Washington, D.C., and outpost picket duty until October. White's Ford, Md., October 12. Movement up the Potomac to Leesburg, then to Falmouth, Va., October 11-November 19. Battle of Fredericksburg December 12âÂÂ15. Burnside's 2nd Campaign, "Mud March," January 20âÂÂ24, 1863. At Falmouth until April. Chancellorsville Campaign April 27-May 6. Battle of Chancellorsville May 1âÂÂ5. Gettysburg Campaign June 11-July 24. Battle of Gettysburg July 1âÂÂ3. Pursuit of Lee July 5âÂÂ24. Wapping Heights, Va., July 23. Duty on line of the Rappahannock until October. Bristoe Campaign October 9âÂÂ22. Auburn October 13. Advance to line of the Rappahannock November 7âÂÂ8. Kelly's Ford November 7. Mine Run Campaign November 26-December 2. Payne's Farm November 27. Demonstration on the Rapidan February 6âÂÂ7, 1864. Duty near Brandy Station until May. Rapidan Campaign May 4-June 12. Battles of the Wilderness May 5âÂÂ7. Laurel Hill May 8. Spotsylvania May 8âÂÂ12. Po River May 10. Spotsylvania Court House May 12âÂÂ21. Assault on the Salient May 12. Harris Farm, Fredericksburg Road May 19. North Anna River May 23âÂÂ26. On line of the Pamunkey May 26âÂÂ28. Totopotomoy May 28âÂÂ31. Cold Harbor June 1âÂÂ12. Before Petersburg June 16âÂÂ18. Siege of Petersburg June 16, 1864, to April 2, 1865. Jerusalem Plank Road June 21âÂÂ23, 1864. Demonstration on north side of the James at Deep Bottom July 27âÂÂ29. Deep Bottom July 27âÂÂ28. Mine Explosion, Petersburg, July 30 (reserve). Demonstration on north side of the James River at Deep Bottom August 13âÂÂ18. Strawberry Plains, Deep Bottom, August 14âÂÂ18. Poplar Springs Church September 29-October 2. Boydton Plank Road, Hatcher's Run, October 27âÂÂ28. Raid on Weldon Railroad December 7âÂÂ12. Dabney's Mills, Hatcher's Run, February 5âÂÂ7, 1865. Watkins' House, Petersburg, March 25. Appomattox Campaign March 28-April 9. Crow's House March 31. Fall of Petersburg April 2. Sailor's Creek April 6. High Bridge, Farmville, April 7. Appomattox Court House April 9. Surrender of Lee and his army. At Burkesville until May 2. March to Washington, D.C., May 2âÂÂ12. Grand Review of the Armies May 23.
The regiment lost a total of 235 men during service; 9 officers and 113 enlisted men killed or mortally wounded, 1 officer and 112 enlisted men died of disease.