99th Regiment
Pennsylvania Volunteers
Field and Staff Officers
| Name | Rank | Date of Muster | Remarks |
| Thos. W. Sweeney | Colonel | November 9, 1861 | Resigned January 24, 1862 |
| Peter Fritz | Colonel | February 25, 1862 | Resigned June 10, 1864 |
| Asher S. Leidy | Colonel | August 19, 1861 | Promoted from Major to Lt. Colonel, February 1, 1862; to Colonel, June 11, 1862; wounded at Fredericksburg, Va., December 13, 1862; discharged April 9, 1864 |
| Edwin R. Biles | Colonel | February 25, 1862 | Promoted from Adjutant to Lt. Colonel, July 1, 1862; to Colonel, August 23, 1864; to brevet Brigadier General, March 13, 1865; wounded at Spottsylvania Court House, May 12, 1864, at Deep Bottom, August 17, 1864, and at Petersburg, Va., March 25, 1865; mustered out with Regiment, July 1, 1865 |
| Romaine Lujeane | Lt. Colonel | Resigned November 7, 1861 | |
| Wm. P. Seymour | Lt. Colonel | November 9, 1861 | Resigned January 30, 1862 |
| Peter Fritz, Jr. | Lt. Colonel | February 25, 1862 | Promoted from Captain, Company B, October 3, 1864; to brevet Colonel and brevet Brigadier General, March 13, 1865; mustered out with Regiment, July 1, 1865 |
| Henry A. Read | Major | October 25, 1861 | Promoted from Captain, Company G, March 11, 1862; dismissed February 19, 1863 |
| John W. Moore | Major | July 9, 1861 | Promoted from Captain, Company K, February 20, 1863; commissioned Lt. Colonel, April 10, 1864, not mustered; to Colonel, 203d Regiment P. V., September 16, 1864 |
| Geo. V. Tomlinson | Major | June 1, 1861 | Promoted from Captain, Company I, May 15, 1865; mustered out with Regiment, July 1, 1865 |
| Wash. M. Worrall | Adjutant | August 17, 1861 | Promoted from 1st Lt., Company D, August 1, 1862; to Captain, Company D, January 30. 1863 |
| Geo. H. Hickman | Adjutant | October 10, 1861 | Promoted from private, Company F, February 2, 1863; mustered out October 12, 1864; expiration of term |
| John Simpson | Quarter Master | July 26, 1861 | Promoted from 1st Lt., Company A, November 1, 1861; discharged September 17, 1863 |
| Samuel Morrison | Quarter Master | July 31, 1861 | Promoted from 2d Lt., Company B, November 13, 1863; mustered out, October 11, 1864; expiration of term |
| Robert Perry | Quarter Master | January 18, 1862 | Promoted from Quarter Master Sergeant, November 18, 1864; mustered out with Regiment, July 1, 1865 |
| James K. Rodgers | Surgeon | September 18, 1861 | Transferred to 63d Regiment P. V., February 17, 1862 |
| W. H. Worthington | Surgeon | October 14, 1861 | Transferred from 63d Regiment P.V., February 17, 1862; resigned May 28, 1862 |
| W. T. W. Dickeson | Surgeon | July 17, 1861 | Promoted from Assistant Surgeon, 33d Regiment P. V., July 2, 1862; resigned January 16, 1863 |
| Charles Stver | Surgeon | Dismissed March 23, 1863 | |
| Silas Updegrove | Surgeon | May 16, 1863 | Discharged October 27, 1864 |
| David P. Boyer | Surgeon | December 24, 1864 | Mustered out with Regiment, July 1, 1865 |
| James M. Hoffman | Assistant Surgeon | September 25, 1861 | Promoted to Surgeon, 155th Regiment P. V., October 15, 1862 |
| B. F. Buchter | Assistant Surgeon | August 4, 1862 | Resigned January 17, 1863 |
| George Lotz | Assistant Surgeon | September 18, 1862 | Promoted to Surgeon 28th Regiment Pa. EmergencyInfantry, June 22, 1863 |
| Chas. W. Backhus | Assistant Surgeon | March 5, 1863 | Promoted to Surgeon, 203d Regiment P. V., October 17, 1864 |
| Jos. H. Gallag | Assistant Surgeon | January 5, 1865 | Discharged June 3, 1865 |
| James E. Wilson | Chaplain | August 19, 1861 | Resigned May 29, 1862 |
| L. Richmond Janes | Chaplain | September 9, 1864 | Discharged April 27, 1865 |
| Benjamin F. Groff | Sergeant Major | August 8, 1861 | Promoted to 2d Lt., Company C, November 1, 1864; Vet |
| William H. Phillips | Sergeant Major | August 8, 1861 | Promoted from Sergeant Company C; to 2d Lt., Company F, May 1, 1865; Vet |
| James Ennis | Sergeant Major | September 10, 1861 | Promoted to 2d Lt., Company F, December 1, 1862 |
| John M'Clung. | Sergeant Major | January 4, 1864 | Promoted from Sergeant, Company H, May 1, 1865; mustered out with Regiment, July 1, 1865; Vet |
| John Arrison | Quarter Master Sergeant | February 29, 1864 | Promoted from priv., Company B, November 18, 1864; commissioned 2d Lt. Company B., April 21, 1865, not mustered; mustered out with Regiment, July 1, 1865; Vet |
| Fred'k W. Lewis | Quarter Master Sergeant | July 31, 1861 | Promoted from 1st Sergeant, Company B, date unknown; to 1st Lt., Company B, July 20, 1864; Vet |
| David Stewart | Commissary Sergeant | September 4, 1861 | Promoted from Sergeant, Company E, May 1, 1865; mustered out with Regiment, July 1, 1865; Vet |
| John Witmire | Commissary Sergeant | January 25, 1864 | Promoted to 2d Lt., Company H, January 25, 1865; Vet |
| Hugh O'Neil | Commissary Sergeant | October 22, 1861 | Promoted to 2d Lt., Company G, May 1, 1865; Vet |
| George C. Foster | Hospital Steward | May 28, 1861 | Promoted from priv.,Company K, May 26, 1865; mustered out with Regiment, July 1, 1865; Vet |
| Peter Paul Fuchs | Hospital Steward | October 12, 1862 | Discharged on Surgeon's Certificate, May 26, 1865 |
| Thomas Carberry | Principal Musician | January 4, 1864 | Mustered out with Regiment, July 1, 1865; Vet |
| Theodore Ream | Principal Musician | January 7, 1862 | Promoted from Musician, September 20, 1863; discharged by General Order, May 31, 1865 |
Source: Bates, Samuel P. History of the Pennsylvania Volunteers, 1861-1865 , Harrisburg, 1868-1871.
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