(II) 21st Ohio Infantry

== Regimental History and Service Record ==
Organized at Findlay, Ohio, and mustered in September 19, 1861. Left State for Nicholasville, Ky., October 2. Attached to Thomas' Command, Army of the Ohio, to November, 1861. 9th Brigade, Army of the Ohio, to December, 1861. 9th Brigade, 3rd Division, Army of the Ohio, to July, 1862. 7th Independent Brigade, Army of the Ohio, to September, 1862. 7th Brigade, 8th Division, Army of the Ohio, to November, 1862. 3rd Brigade, 2nd Division, Center 14th Army Corps, Army of the Cumberland, to January, 1863. 3rd Brigade, 2nd Division, 14th Army Corps, to October, 1863. 3rd Brigade, 1st Division, 14th Army Corps, to June, 1865. 1st Brigade, 1st Division, 14th Army Corps, to July, 1865.
SERVICE.--Action at Ivy's Mountain, Ky., November 8, 1861. Try Mountain and Piketown November 8-9. Duty at Bacon Creek and Green River, Ky., until February, 1862. Advance on Bowling Green, Ky., February 10-15, and on Nashville, Tenn., February 22-25. Occupation of Nashville February 25-March 17. Advance on Murfreesboro, Tenn., March 17-19. Advance on Huntsville, Ala., April 4-11. Capture of Huntsville April 11. (Pittinger's Raid on Georgia State Railroad April 7-12, Detachment.) Near Pulaski May 1. At Athens May 28 to August 28. Action on Richland Creek near Pulaski August 27. March to Nashville August 29-September 2. Siege of Nashville September 12-November 7. Murfreesboro Road November 8. Advance on Murfreesboro December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty at Murfreesboro until June. Middle Tennessee or Tullahoma Campaign June 23-July 7. Occupation of Middle Tennessee until August 16. 
* August 16-September 22, 1863 - The Chickamauga Campaign
** Davis Cross Roads or Dug Gap September 11. 
** September 19-September 20, 1863 - Battle of Chickamauga, Georgia
* September 24-October 27, 1863 - Siege of Chattanooga, Tennessee
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign
** Orchard Knob November 23-24.
** Mission Ridge November 25.
** Pursuit to Graysville November 26-27.
** Rossville Gap November 26.
* Regiment reenlisted January 1, 1864.
* Reconnaissance of Dalton, Ga., February 22-27, 1864 (Non-Veterans).
* Rocky Faced Ridge and Buzzard's Roost Gap February 23-25 (Non-Veterans). 
* May 1-September 8, 1864 - The Atlanta Campaign
** May 8-11, 1864 - Demonstration against Rocky Faced Ridge, Georgia
** Buzzard's Roost Gap May 8-9. 
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Advance on Dallas May 18-25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia 
** Operations about Marietta and against Kenesaw Mountain June 10-July 2, 
** Pine Hill June 11-14. 
** Lost Mountain June 15-17. 
** Assault on Kenesaw June 27. 
** Ruff's Station July 4. 
** Chattahoochie River July 5-17. 
** Vining Station July 9-11. 
** Peach Tree Creek July 19-20. 
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Utoy Creek August 5-7. 
** Flank movement on Jonesboro August 25-30. 
* Operations against Hood in North Georgia and North Alabama April 29-November 3. 
* October 2, 1864 - Skirmish near Atlanta, Georgia 
* November 15-December 21, 1864 - The Savannah Campaign
** Jacksonboro December 11. 
** December 10-21, 1864 - Siege of Savannah, Georgia
* January 1-April 26, 1865 - The Carolinas Campaign
** Taylor's Hole Creek, Averysboro, N. C., March 16. 
** Battle of Bentonville, N. C., March 19-21. 
** Occupation of Goldsboro March 24. 
** Advance on Raleigh April 10-14. 
** Occupation of Raleigh April 14. 
** Bennett's House April 26. 
*** Surrender of Johnston and his army. 
* March to Washington, D.C., via Richmond, Va., April 29-May 19. 
* Grand Review May 24. 
* Moved to Louisville, Ky., June, and duty there until July. 
* Mustered out July 25, 1865.
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties	Remarks
Dyer 	
* 6 Officers and 166 enlisted men killed and mortally wounded 
* 2 Officers and 218 enlisted men killed by disease
* Total 392	None
Fox 	
* Fox lists this unit as:
** 95th on the list of units with losses based on duration of the entire term of service of the unit (5th of the Ohio troops)	
WotRWiki Statistics	
* troops killed
** Includes troops mortally wounded
** Includes troops killed by disease
** All others are troops killed in action or under special circumstances	
== Legacy ==
== Notes ==
== Sources == 
* (Pages 701, 703, 704, 705, 707, 715, 719, 721, 723, 834, 860, 862, 866, 1506)
* (Page 13)
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