21st Illinois Infantry

== Regimental History and Service Record ==
Organized at Mattoon, Ill., and mustered in June 28, 1861. Ordered to Ironton, Mo., July 3, 1861. Operations on line of Hannibal & St. Jo. R. R. at Mexico, Mo., until August. Reached Ironton, Mo., August 9. Attached to Department of Missouri to March, 1862. Steele's Command, Army of Southeast Missouri, to May, 1862. 2nd Brigade, 4th Division, Army of Mississippi, to September, 1862. 31st Brigade, 9th Division, Army of the Ohio, to October, 1862. 31st Brigade, 9th Division, 3rd Army Corps, Army of the Ohio, to November, 1862. 2nd Brigade, 1st Division, Right Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 2nd Brigade, 1st Division, 20th Army Corps, Army of the Cumberland, to October, 1863. 1st Brigade, 1st Division, 4th Army Corps, Army of the Cumberland, to June, 1865. 2nd Brigade, 1st Division, 4th Army Corps, to August, 1865. Department of Texas to December, 1865.
SERVICE.--Duty at Ironton, Mo., until January, 1862. Operations about Ironton, Mo., October 17-25, 1861. Action at Fredericktown October 21. March from Ironton to Greenville January 29, 1862, and duty there until March. Moved to Reeve's Station, on Black River, March 3-10, thence to Doniphan and Pocohontas, Ark., March 31-April 21. Action at Putnam Ferry April 1. March to Jacksonport, Ark., April 30-May 4, thence to Cape Girardeau, Mo., May 10-21, and to Hamburg Landing May 21-24. Siege of Corinth, Miss., May 26-30. Pursuit to Booneville May 31-June 12. March to Jacinto and Ripley June 29-July 4. At Corinth, until August 14. March through Alabama to Nashville, Tenn., and to Louisville, Ky., in pursuit of Bragg, August 14-September 26. Pursuit of Bragg into Kentucky October 1-16. 
* October 8, 1862 - Battle of Perryville, Kentucky 
Stanford October 14. March to Nashville, Tenn., October 16-November 9, and duty there until December 26. Advance on Murfreesboro December 26-30. Nolensville, Knob Gap, December 26. Battle of Stone River December 30-31, 1862, and January 1-3, 1863. At Murfreesboro until June. Reconnaissance from Murfreesboro March 6-7. Methodist Church, Shelbyville Pike, March 6. Reconnaissance to Versailles March 9-14. Middle Tennessee (or Tullahoma) Campaign June 24-July 7. Liberty Gap June 24-27. Occupation of Middle Tennessee until August 16. 
* August 16-September 22, 1863 - The Chickamauga Campaign
** September 19-September 20, 1863 - Battle of Chickamauga, Georgia
* September 24-October 27, 1863 - Siege of Chattanooga, Tennessee
Reopening Tennessee River October 26-29. Duty at Bridgeport, Ala., until January 26, 1864. Moved to Ooltewah January 26. Veterans absent on furlough until June. Non-Veterans attached to 101st Ohio Infantry until June 4, when Veterans returned. 
* May 1-September 8, 1864 - The Atlanta Campaign
** Tunnel Hill May 6-7. 
** Demonstration on Rocky Faced Ridge May 8-11. 
** Buzzard's Roost Gap May 8-9. 
** May 9-13, 1864 - Demonstration on Dalton, Georgia
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Near Kingston May 18-19. 
** Near Cassville May 19. 
** Advance on Dallas May 23-25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia
** Operations about Marietta and against Kenesaw Mountain June 10-July 2. 
** Pine Mount June 10. 
** 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. 
** Peach Tree Creek July 19-20. 
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Flank movement on Jonesboro August 25-30. 
** Battle of Jonesboro August 31-September 1. Lovejoy Station September 2-6. 
Pursuit of Hood into Alabama October 3-30. Nashville Campaign November-December. Columbia, Duck River, November 24-27. Spring Hill November 29. Battle of Franklin November 30. Battle of Nashville December 15-16. Pursuit of Hood to the Tennessee River December 17-28. March to Huntsville, Ala., and duty there until March 13, 1865. Operations in East Tennessee until April 11. At Nashville, Tenn., until June. Moved to New Orleans, La., June 17-25, thence to Indianola, Texas, July 12-15. Duty at San Antonio, Texas, until December. Mustered out at San Antonio, Texas, December 16, and discharged at Camp Butler, Ill., January 18, 1866.
== Regimental Roster ==
 
 
 Field and Staff Officers
 
 
 Regimental Band
 
 
 Company A
 
 
 Company B
 
 
 Company C
 
 
 Company D
 
 
 Company E
 
 
 Company F
 
 
 Company G
 
 
 Company H
 
 
 Company I
 
 
 Company K
 
 
 Unassigned
 
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== Regiment Statistical Information ==
* Regiment lost during service 6 Officers and 124 Enlisted men killed and mortally wounded and 2 Officers and 140 Enlisted men by disease. Total 272.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 701, 703, 705, 707, 715, 733, 860, 862, 1053-1054)
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