100th Illinois Infantry

== Regimental History and Service Record ==
Organized at Joliet, Ill., and mustered in August 30, 1862. Left state for Louisville, Ky., September 2, 1862. Attached to 1st Brigade, 2nd Division, Army of Kentucky, Dept. of the Ohio, to October, 1862. 15th Brigade, 6th Division, 2nd Army Corps, Army of the Ohio, to November, 1862. 1st Brigade, 1st Division, Left Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 1st Brigade, 1st Division, 21st Army Corps, Army of the Cumberland, to October, 1863. 2nd Brigade, 2nd Division, 4th Army Corps, to June, 1865.
SERVICE.--Pursuit of Bragg Into Kentucky October 1-18. Battle of Perryville, Ky., October 8 (Reserve). Nelson's Cross Roads October 18. March to Nashville, Tenn., October 18-November 26, and duty there until December 26. Advance on Murfreesboro December 26-30. Lavergne December 26-27. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. At Murfreesboro until June. Middle Tennessee or Tullahoma Campaign June 24-July 7. Occupation of Middle Tennessee until August 16. 
* August 16-September 22, 1863 - The Chickamauga Campaign
** Expedition from Tracy City to Tennessee River August 22-24. 
* September 9, 1863 - Occupation of Chattanooga, TennesseeReferenced on Dyer, not on unit homepage
** Near Lee and Gordon's Mills September 17-18. 
** September 19-September 20, 1863 - Battle of Chickamauga, Georgia
* September 24-October 27, 1863 - Siege of Chattanooga, Tennessee
Chattanooga-Ringgold Campaign November 23-27. Battles of Orchard Knob November 23-24;Mission Ridge November 25. March to relief of Knoxville and operations in East Tennessee December 28-February 1, 1864. At Athens, Tenn., February to April. 
* 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 9-13, 1864 - Demonstration on Dalton, Georgia
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** May 17, 1864 - Engagement at Adairsville, Georgia
** Near Kingston May 18-19. 
** Near Cassville May 19. 
** Advance on Dallas May 22-25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia
** Operations about Marietta and against Kenesaw Mountain June 10-July 2. 
** Pine Mountain June 11-14. 
** Lost Mountain June 15-17. 
** Assault on Kenesaw June 27. 
** Ruff's Station, Smyrna Camp Ground, July 4. 
** Chattahoochie River July 5-17. 
** Buckhead, Nancy's Creek, July 18. 
** 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. 
* Operations against Hood in North Georgia and North Alabama September 28-November 3. 
Nashville (Tenn.) 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. Moved to Huntsville, Ala., and duty there until March, 1865. Expedition to Bull's Gap and operations in East Tennessee March 20-April 22. Moved to Nashville, Tenn., and duty there until June. Mustered out at Nashville, Tenn., June 12, and discharged at Chicago, II1., June 15, 1865.
== 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 7 Officers and 73 Enlisted men killed and mortally wounded and 134 Enlisted men by disease. Total 214.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 701, 703, 704, 705, 706, 707, 715, 860, 861, 862, 1089)
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