18th Illinois Infantry

== Regimental History and Service Record ==
Organized at Aurora, Ill., and mustered into State service May 19, and into U.S. service May 28, 1861. Moved to Bird's Point, Mo., June 24, and duty there until August 26. Moved to Mound City August 26, and duty there until October 5. Moved to Cairo, Ill., October 5, and duty there until February, 1862. Attached to District of Cairo, to October, 1861. 1st Brigade, District of Cairo, to February, 1862. 1st Brigade, 1st Division, District of Cairo, February, 1862. 2nd Brigade, 1st Division, District of West Tenn., March, 1862. 1st Brigade, 1st Division, 1st District, West Tenn., and Army of the Tennessee, to July, 1862. 1st Brigade, 1st Division, District of Jackson, Tenn., to September, 1862. 2nd Brigade, 1st Division, District of Jackson, to November, 1862. District of Jackson, 13th Army Corps (Old), Dept. of the Tennessee, to December, 1862. 1st Brigade, District of Jackson, 16th Army Corps, to March, 1863. 2nd Brigade, 3rd Division, 16th Army Corps, to May, 1863. 2nd Brigade, Kimball's Provisional Division, 16th Army Corps, to July, 1863. 2nd Brigade, Kimball's Provisional Division, District of Eastern Ark., to August, 1863. 1st Brigade, 2nd Division, Arkansas Expedition, to November, 1863. 3rd Brigade, 2nd Division, Arkansas Expedition, to January, 1864. 3rd Brigade, 2nd Division, 7th Army Corps, Dept. of Arkansas, to April, 1864. Post Pine Bluff, Ark., 7th Army Corps, to May, 1864. 1st Brigade, 2nd Division, 7th Army Corps, to January, 1865. Pontoneers, 7th Army Corps, to May, 1865. 1st Brigade, 1st Division, 7th Army Corps, to August, 1865. Dept. of Arkansas, to December, 1865.
SERVICE.--Expedition against Thompson's forces at Bloomfield, Mo., November 2-12, 1861. Expedition toward Columbus January 16-21, 1862. Operations against Fort Henry, Tenn., February 2-8. Capture of Fort Henry February 6. Investment and capture of Fort Donelson February 12-16. 
* Moved to Pittsburg Landing, Tenn., March 11-23. 
* April 6-7, 1862 - Battle of Shiloh, Tennessee
Advance on and siege of Corinth, Miss., April 29-May 30. Moved to Bethel June 4-6, thence to Jackson June 15, and duty there until May 30, 1863. Expedition to Bolivar and Brownville July 27-August 13, 1862. Grant's Central Mississippi Campaign October 31, 1862, to January 10, 1863. (Co. "K" left Regiment, December 11, 1862, to join Miss. Marine Brigade.) Operations against Forest, in West Tennessee December 18, 1862, to January 3, 1863. Clarksburg, Tenn., December 30, 1862 (Cos. "A" and "E"). Engagement at Red Mound, Parker's Cross Roads, December 30-31 (Detachment). Near Clifton January 3, 1863. Expedition to Huntington March 4-10. Scout to Trenton March 16-18. 
* March 23-May 3, 1864 - Expedition from Little Rock to Camden, ArkansasNot originally referenced on unit homepage
Expedition to Covington, Tenn., April 1-10, and to Summerville April 11-16. Moved to Vicksburg, Miss., May 30-June 2. 
* May 18-July 4, 1863 - Siege of Vicksburg, Mississippi
Occupation of Hickman, Ky., July 15-16 (Co. "K"). Moved to Helena, Ark., July 24-27. Steele's Expedition against Little Rock, Ark., August 1-September 10. Bayou Fourche and capture of Little Rock September 10. Duty at Little Rock, Pine Bluff and Duvall's Bluff, Ark., until December, 1865. Expedition from Pine Bluff to Mt. Elba and Longview March 27-31, 1864. Actions at Mt. Elba March 28 and 30. Non-Veterans mustered out May 28, 1864. Regiment mustered out at Little Rock, Ark., December 16, and discharged at Camp Butler, Ill., December 31, 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 6 Officers and 99 Enlisted Men killed and mortally wounded and 7 Officers and 282 Enlisted men by disease. Total 394.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 682, 779, 846, 1052)
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