90th Illinois Infantry

== Regimental History and Service Record ==
Organized at Chicago, Ill., and mustered in September 7, 1862. Engaged in guard duty at Camp Douglas, Chicago, Ill., until November 27, 1862. Moved to Cairo, Ill., thence to Columbus, Ky., and LaGrange, Tenn., November 27-December 2. Attached to R. R. Guard, 13th Army Corps (Old), Dept, of the Tennessee, to January, 1863. 3rd Brigade, 1st Division, 16th Army Corps, Dept. of the Tennessee, to March, 1863. 1st Brigade, 1st Division, 16th Army Corps, to July, 1863. 1st Brigade, 4th Division, 15th Army Corps, to September, 1864. 3rd Brigade, 2nd Division, 15th Army Corps, to June, 1865.
SERVICE.---Grant's Central Mississippi Campaign December 5, 1862, to January 10, 1863. Guard bridges at Coldwater. Action at Holly Springs and Coldwater December 20, 1862. Duty at LaGrange and Lafayette, on Memphis & Charleston R. R., until June, 1863. Moved to Memphis, Tenn., thence to Vicksburg, Miss., June 7-17. 
* May 18-July 4, 1863 - Siege of Vicksburg, Mississippi
* Advance on Jackson July 4-10. 
* Siege of Jackson, Miss., July 10-17. 
* At Big Black until September 27. 
* September 26-November 20, 1863 - Expedition from Vicksburg, Mississippi to Chattanooga, Tennessee
* Operations on Memphis & Charleston R. R. in Alabama October 20-29. 
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign
** Tunnel Hill November 23-24
** Mission Ridge November 25.
** Pursuit to Graysville November 26-27.
* March to relief of Knoxville, Tenn., November 28-December 17.
* At Scottsboro, Ala., until May, 1864. 
* May 1-September 8, 1864 - The Atlanta Campaign
** May 8-13, 1864 - Demonstration on Resaca, Georgia
*** May 13, 1864 - Combat at Resaca, Georgia
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Near Kingston May 19-22. 
** 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. 
** Brush Mountain June 15. 
** Assault on Kenesaw June 27. 
** Nickajack Creek July 2-5. 
** Chattahoochee River July 5-17. 
** July 22, 1864 - Battle of Atlanta, Georgia
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Ezra Chapel, Hood's second sortie, July 28.
** 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 29-November 3. 
** Rome and Gadsden October 4. 
** Reconnaissance on Cave Springs Road and skirmishes October 12-13. 
** Reconnaissance from Gaylesville, Ala., to Turkeytown October 25. 
* November 15-December 21, 1864 - The Savannah Campaign
** Jenks' Bridge, Ogeechee River, December 7. 
** Near Bryan's Court House December 8. 
** December 10-21, 1864 - Siege of Savannah, Georgia
*** Assault and capture of Fort McAllister December 13. 
* January 1-April 26, 1865 - The Carolinas Campaign
** Salkehatchie Swamps, S. C., February 2-5. 
** South Edisto River February 9. 
** North Edisto River February 12-13. 
** Columbia February 15-17. 
** Battle of Bentonville, N. C., March 20-21. 
** 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. 
* Mustered out June 10, 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 2 Officers and 58 Enlisted men killed and mortally wounded and 1 Officer and 87 Enlisted men by disease. Total 148.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 703, 705, 707, 714, 715, 721, 722, 779, 783, 834, 866, 1084-1085)
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