100th Pennsylvania Infantry

   

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in Pennsylvania Infantry

Editor’s Note: Do you have information on this unit’s role at the Siege of Petersburg?  Please contact us using the Contact button in the menu at the top of the screen.  We are happy to exchange information with other researchers.

Muster In: Organized at Pittsburg August 31, 1861.1

Muster Out:  Mustered out July 24, 1865.2

Commander(s):
Lieutenant Colonel Joseph H. Pentecost
Commander Image

Major Thomas J. Hamilton
Commander Image

Major Norman J. Maxwell
Commander Image

Commander 4
Commander Image

First Offensive Order of Battle: Second Brigade | First Division | IX Corps | Army of the Potomac | Union Army3

Second Offensive Order of Battle: First Brigade | First Division | IX Corps | Army of the Potomac | Union Army 5

Third Offensive Order of Battle: First Brigade | First Division | IX Corps | Army of the Potomac | Union Army8,9

  • Commander:
    • Major Thomas J. Hamilton (July 30-31(?), 1864)(wounded and captured July 30, 1864)10,11
  • Unit Strength:
  • Weapons:

Fourth Offensive Order of Battle: First Brigade | First Division | IX Corps | Army of the Potomac | Union Army12,13

  • Commander: Captain Joseph H. Pentecost (August 31, 1864)14
  • Unit Strength: 180 officers and men PFD (August 4, 1864)15
  • Weapons:

Fifth Offensive Order of Battle: Third Brigade | First Division | IX Corps | Army of the Potomac | Union Army16,17

  • Commander: Lieutenant Colonel Joseph H. Pentecost (September 1, 1864)18
  • Unit Strength:
  • Weapons:

Sixth Offensive Order of Battle: Third Brigade | First Division | IX Corps | Army of the Potomac | Union Army19,20

  • Commander: Lieutenant Colonel Joseph H. Pentecost (October 31, 1864)21
  • Unit Strength:
  • Weapons:

Seventh Offensive Order of Battle: Third Brigade | First Division | IX Corps | Army of the Potomac | Union Army22

  • Commander: Lieutenant Colonel Joseph H. Pentecost (December 31, 1864)23
  • Unit Strength:
  • Weapons:

Eighth Offensive Order of Battle: Third Brigade | First Division | IX Corps | Army of the Potomac | Union Army24,25

  • Commander: Lieutenant Colonel Joseph H. Pentecost (January 31 & February 28, 1865)26,27
  • Unit Strength:
  • Weapons:

Ninth Offensive Order of Battle: Third Brigade | First Division | IX Corps | Army of the Potomac | Union Army28,29,30

  • Commander:
    • Lieutenant Colonel Joseph H. Pentecost (March 25, 1865)(wounded March 25, 1865 and died the next day)31,32
    • Major Norman J. Maxwell (at least March 25 & 31, 1865)33,34
  • Unit Strength:
  • Weapons:
  • Note: This unit is listed in the casualty returns for the Battle of Fort Stedman, March 25, 1865, implying it was present during the battle.35

Dyer’s/Sifakis’ Compendium Info:
Siege of Petersburg Battles36:

  • 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 Springs Church September 29-October 2.
  • Reconnaissance on Vaughan and Squirrel Level Road November 8.
  • Boydton Plank Road, Hatcher’s Run, October 27-28.
  • Fort Stedman March 25, 1865.
  • Appomattox Campaign March 28-April 9.
  • Assault on and fall of Petersburg April 2.
  • Occupation of Petersburg April 3.
  • Pursuit of Lee April 3-8.

Bibliography:

Siege of Petersburg Documents Which Mention This Unit:

Links:

Sources:

  1. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
  2. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
  3. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 1 (Serial Number 80), p. 228
  4. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 100th Pennsylvania Entry, Page 54; Summary Statements of Quarterly Returns of Ordnance and Ordnance Stores on Hand in Regular and Volunteer Army Organizations, 1862-1867, 1870-1876. (National Archives Microfilm Publication M1281, Roll 7); Records of the Office of the Chief of Ordnance, 1797-1969, Record Group 156; National Archives Building, Washington, D.C.
  5. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 2 (Serial Number 81), p. 549
  6. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 2 (Serial Number 81), p. 549
  7. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 100th Pennsylvania Entry, Page 54; Summary Statements of Quarterly Returns of Ordnance and Ordnance Stores on Hand in Regular and Volunteer Army Organizations, 1862-1867, 1870-1876. (National Archives Microfilm Publication M1281, Roll 7); Records of the Office of the Chief of Ordnance, 1797-1969, Record Group 156; National Archives Building, Washington, D.C.
  8. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 1 (Serial Number 80), page 259
  9. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 3 (Serial Number 82), page 734
  10. The One Hundredth Pennsylvania Regiment.” Philadelphia Evening Bulletin. August 2, 1864, p. ? col. ?: “The following casualties among the officers of the One Hundredth Pennsylvania Regiment occurred on Saturday last before Petersburg: …Major T. J. Hamilton, in command of regiment, wounded and a prisoner…”
  11. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XL, Part 3 (Serial Number 82), page 734: The Official Records still have Hamilton in command on July 31, 1864, but this appears to be incorrect.  Many other sources point to Hamilton as having been mortally wounded at the Crater on July 30.
  12. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 2 (Serial Number 88), page 616: “Organization of the Army of the Potomac…August 31, 1864”
  13. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 1 (Serial Number 87), page 126: “Return of Casualties in the Union Forces (August 1864)”
  14. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 2 (Serial Number 88), page 616: “Organization of the Army of the Potomac…August 31, 1864”
  15. From Before Petersburg, Va.Vicksburg Daily Herald. August 16, 1864, p. ? col. ?
  16. Sommers, Richard J. “Grant’s Fifth Offensive at Petersburg: A Study in Strategy, Tactics, and Generalship.  The Battle of Poplar Spring Church, the First Battle of the Darbytown Road, the Second Battle of the Squirrel Level Road, the Second Battle of the Darbytown Road (Ulysses S. Grant, Virginia).” Doctoral Thesis. Rice University, 1970. Print. p. 1301.
  17. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 1 (Serial Number 87), page 141: “Return of Casualties in the Union Forces (September-October 1864)”
  18. Colonel Leasure and the Roundheads.” Philadelphia Evening Bulletin. September 7, 1864, p. ? col. ?: “Captain Pentecost, of Co. A, who was promoted to be Lieutenant-Colonel, now commands the regiment.”
  19. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 3 (Serial Number 89), page 462: “Organization of the Union Forces” (October 31, 1864)”
  20. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 1 (Serial Number 87), page 158: “Return of Casualties in the Union Forces…Boydton Plank Road, Va., October 27-28, 1864”
  21. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 3 (Serial Number 89), page 462: “Organization of the Union Forces” (October 31, 1864)”
  22. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 3 (Serial Number 89), page 1121: “Organization of the Union Forces” (December 31, 1864)
  23. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLII, Part 3 (Serial Number 89), page 1121: “Organization of the Union Forces” (December 31, 1864)
  24. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 2 (Serial Number 96), page 331: “Organization of the Union Forces” (January 31, 1865)
  25. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 2 (Serial Number 96), page 745: “Organization of the Union Forces” (February 28, 1865)
  26. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 2 (Serial Number 96), page 331: “Organization of the Union Forces” (January 31, 1865)
  27. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 2 (Serial Number 96), page 745: “Organization of the Union Forces” (February 28, 1865)
  28. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 1 (Serial Number 95), page 573: “Organization of the Union Forces” (March 31, 1865)
  29. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 1 (Serial Number 96), page 70: “Return of Casualties in the Union forces at Fort Stedman… (March 25, 1865)”
  30. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 1 (Serial Number 95), page 589: “Return of casualties in the Union Forces commanded by Lieut. Gen. Ulysses S. Grant, March 29-April 9, 1865”
  31. Skirmish at Fort Stedman.” Bluffton (IN) Chronicle. January 22, 1913, p. ? col. ?
  32. No Title. West Middleton (PA) Press. May 27, 1934, p. ? col. ?
  33.  Beyer, Walter F. and Keydel, Oscar F. Deeds of Valor: How America’s Heroes Won the Medal of Honor…, Volume 1 (The Perrien – Keydel  Company: 1901), pp. 497-499: “An occurrence that followed is the subject of an interesting story told by Captain Joseph F. Carter of Company D, Third Maryland Infantry. The captain was in command of his regiment on the expedition to recapture the fort, while the One hundredth Pennsylvania was led by Major N. J. Maxwell.”
  34. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 1 (Serial Number 95), page 573: “Organization of the Union Forces” (March 31, 1865)
  35. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XLVI, Part 1 (Serial Number 96), page 70: “Return of Casualties in the Union forces at Fort Stedman… (March 25, 1865)”
  36. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)

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