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Muster In: Organized by direction of the President May 4, 1861, and confirmed by Act of Congress July 29, 1861.1
Muster Out: Unit existed after the Civil War.2

Commander(s):
(Brevet?) Major Matthew M. Blunt
Commander Image

Captain Philip W. Stanhope
Commander Image

Captain Francis Wister
Commander Image

Commander 4
Commander Image

First Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army3,4

Second Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army6,7

Third Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army10,11

  • Commander:
    • (Brevet?) Major Matthew M. Blunt (July 2, 1864)12
    • Captain Philip W. Stanhope (July 31, 1864)13
  • Unit Strength:
  • Weapons:

Fourth Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army14,15

  • Commander: Captain Philip W. Stanhope (August 31, 1864)16
  • Unit Strength:
  • Weapons:

Fifth Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army17,18

  • Commander:
  • Unit Strength:
  • Weapons:

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

  • Commander: Captain Francis Wister (October 31, 1864)21
  • Unit Strength:
  • Weapons:

Seventh Offensive Order of Battle: First Brigade | Second Division | V Corps | Army of the Potomac | Union Army (Nov. 1-2, 1864)22

  • Commander:
  • Unit Strength:
  • Weapons:
  • Note: The 12th United States Infantry moved to New York November 2-6, 1864.23

Eighth Offensive Order of Battle:

  • Was no longer present at the Siege of Petersburg.24

Ninth Offensive Order of Battle:

  • Was no longer present at the Siege of Petersburg.25

Dyer’s/Sifakis’ Compendium Info:
Siege of Petersburg Battles26:

  • Before Petersburg June 16-18.
  • Siege of Petersburg June 16 to November 2.
  • Mine Explosion, Petersburg, July 30 (Reserve).
  • Weldon Railroad August 18-21.
  • Poplar Springs Church, Peeble’s Farm, September 29-October 2.
  • Boydton Plank Road, Hatcher’s Run, October 27-28.
  • Moved to New York November 2-6.

Bibliography:

    Siege of Petersburg Documents Which Mention This Unit:

    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. 224
    4. 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. 546
    5. Volume 13 (Ordnance Returns for the Second Quarter, April-June, 1864); 12th United States Entry, Page 3; 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.: The unit had two battalions.  The first battalion had 140 Springfield Rifles and the second battalion had 124 Springfield Rifles.
    6. 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. 224
    7. 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. 546
    8. 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. 546
    9. Volume 13 (Ordnance Returns for the Second Quarter, April-June, 1864); 12th United States Entry, Page 3; 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.: The unit had two battalions.  The first battalion had 140 Springfield Rifles and the second battalion had 124 Springfield Rifles.
    10. 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 255
    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 732
    12. Twelfth U. S. Infantry.” Sunday Mercury (New York, New York). July 10, 1864, p. 7 col. 1-2
    13. 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 732
    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 615: “Organization of the Army of the Potomac…August 31, 1864”
    15. 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 123: “Return of Casualties in the Union Forces (August 1864)”
    16. 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 615: “Organization of the Army of the Potomac…August 31, 1864”
    17. 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. 1300.
    18. 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 140: “Return of Casualties in the Union Forces (September-October 1864)”
    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 461: “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 156: “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 461: “Organization of the Union Forces” (October 31, 1864)”
    22. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
    23. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
    24. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
    25. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)
    26. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3)

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