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121st New York Infantry

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Muster In: Organized at Herkimer and mustered in August 13, 1862.1
Muster Out: Mustered out June 25, 1865.2

Commander(s):
Brevet Colonel Egbert Olcott
EgbertOlcott121stNYv080p40343

Major Henry M. Galpin
Commander Image

Captain James W. Cronkite
Commander Image

Commander 4
Commander Image

First Offensive Order of Battle: Second Brigade | First Division | VI Corps | Army of the Potomac | Union Army4,5

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

Third Offensive Order of Battle: Second Brigade | First Division | VI Corps | Army of the Potomac | Union Army13

  • Commander: Major Henry M. Galpin (July 31, 1864)14
  • Unit Strength:
  • Weapons:
  • Note: The Second Brigade, First Division, Sixth Corps moved to City Point, Va. on July 9 and embarked for Washington, D.C. on July 10, 1864.15,16

Fourth Offensive Order of Battle:

  • Not present at the Siege of Petersburg.17

Fifth Offensive Order of Battle:

Sixth Offensive Order of Battle:

  • Not present at the Siege of Petersburg.20

Seventh Offensive Order of Battle: Second Brigade | First Division | VI Corps | Army of the Potomac | Union Army21

  • Commander: Captain James W. Cronkite (December 31, 1864)22
  • Unit Strength:
  • Weapons:
  • Note: This unit moved to the Siege of Petersburg from December 9-12, 1864.23

Eighth Offensive Order of Battle: Second Brigade | First Division | VI Corps | Army of the Potomac | Union Army24,25,26

  • Commander: Lieutenant Colonel Egbert Olcott (January 31 & February 28, 1865)27
  • Unit Strength:
  • Weapons:
  • Note: This unit is listed in the casualty returns for the Battle of Hatcher’s Run, February 5-7, 1865, implying it was present during the Eighth Offensive and the battle.28

Ninth Offensive Order of Battle: Second Brigade | First Division | VI Corps | Army of the Potomac | Union Army29,30

  • Commander: Brevet Colonel Egbert Olcott (March 31, 1865)31
  • Unit Strength:
  • Weapons:

Dyer’s/Sifakis’ Compendium Info:
Siege of Petersburg Battles32:

  • Before Petersburg June 17-18.
  • Siege of Petersburg to July 9.
  • Jerusalem Plank Road June 22-23.
  • Moved to Washington, D.C., July 9-11.
  • …away…
  • Moved to Petersburg, Va., December 9-12.
  • Siege of Petersburg December 12, 1864, to April 2, 1865.
  • Dabney’s Mills, Hatcher’s Run, February 5-7, 1865.
  • Appomattox Campaign March 28-April 9.
  • Assault on and fall of Petersburg April 2.
  • Sailor’s Creek April 6.
  • Appomattox Court House April 9.
  • Surrender of Lee and his army.

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. Egbert Olcott image.  MOLLUS-Mass Civil War Photograph Collection, Vol. 80, Page 4034.  United States Army Heritage and Education Center, Carlisle, PA. ↩
  4. 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. 226 ↩
  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. 547 ↩
  6. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 121st New York Entry, Page 1; 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. ↩
  7. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 121st New York Entry, Page 1; 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), p. 226 ↩
  9. 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. 547 ↩
  10. 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. 547 ↩
  11. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 121st New York Entry, Page 1; 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. ↩
  12. Volume 14 (Ordnance Returns for the Second Quarter, April-June, 1864); 121st New York Entry, Page 1; 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. ↩
  13. 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 257 ↩
  14. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XXVII, Part 2 (Serial Number 71), page 550 ↩
  15. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Volume XXVII, Part 1 (Serial Number 70), page 271 ↩
  16. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩
  17. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩
  18. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩
  19. Volume 15 (Ordnance Returns for the Third Quarter, July-September, 1864); 121st New York Entry, Page 120; 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. ↩
  20. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩
  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 1119: “Organization of the Union Forces” (December 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 1119: “Organization of the Union Forces” (December 31, 1864) ↩
  23. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩
  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 329: “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 743: “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 1 (Serial Number 96), page 67: “Return of Casualties in the Union forces at Hatcher’s Run (otherwise known as Dabney’s Mill, Armstrong’s Mill, Rowanty Creek, and Vaughan Road)… (February 5-7, 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 329: “Organization of the Union Forces” (January 31, 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 96), page 67: “Return of Casualties in the Union forces at Hatcher’s Run (otherwise known as Dabney’s Mill, Armstrong’s Mill, Rowanty Creek, and Vaughan Road)… (February 5-7, 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 95), page 571: “Organization of the Union Forces” (March 31, 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 587: “Return of casualties in the Union Forces commanded by Lieut. Gen. Ulysses S. Grant, March 29-April 9, 1865” ↩
  31. 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 571: “Organization of the Union Forces” (March 31, 1865) ↩
  32. A Compendium of the War of the Rebellion by Frederick H. Dyer (Part 3) ↩

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