The 199th Pennsylvania Infantry lost 2 officers and 30 enlisted men killed or mortally wounded and 52 enlisted men to disease during the Civil War.
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1864
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| September and October | Organized at Philadelphia under Colonel James C. Briscoe, Lt. Colonel Ambrose A. Lechler and Major William A. F. Gehr |
| October | Moved to Deep Bottom Landing, Va. Duty in trenches before Richmond, Va. attached to 1st Brigade, 1st Division, 10th Army Corps, Army of the James |
| October 22 | Lt. Colonel Letcher discharged |
| November 28 | Captain Robert P. Hughes of Company C promoted to lieutenant colonel |
| December | Attached to 1st Brigade, 1st Division, 24th Army Corps |
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1865
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| March 28-April 9 | Appomattox Campaign |
| April 2 | Assaults on Forts Gregg and Alexander and Fall of Petersburg |
| April 3-9 | Pursuit of Lee |
| April 6 | Rice’s Station |
| April 9 | Appomattox Court House. Surrender of Lee and his army. |
| April – May | Duty at Richmond, Va. |
| June 28 | Consolidated with 188th Pennsylvania Infantry under Colonel Briscoe |