23rd Illinois Infantry Regiment
(Irish Brigade, Mulligan's Brigade)
Three Year Service
June 15, 1861 - July 24, 1865
Regiment consolidated, August 1864
Assigned to: Battles/Campaigns Engaged in:
Lexington, Winchester, Siege of Petersburg, Appomattox Campaign

Note - A large portion of this Regiment were taken prisoners at the battle of Lexington, Mo., Sep 20, 1861, others returned to their homes, and some enlisted elsewhere. An order of muster out was issued by General Fremont Oct 8, 1861, which was afterward countermanded by the Secretary of War. Many of the early records of the Regiment were destroyed by the enemy. A number of enlisted men returned to the Regiment and were reorganized. These facts explain the absence of record of several men after their muster on Jun 15, 1861.

Adjutant General's Regiment History
Frederick Dyer's Regimental History

Original Organization
23rd Infantry Field & Staff
Non-Commissioned Staff
Unassigned Recruits
 
This Regiment did not have a Band or Unassigned/Substitute/Drafted Recruits

Link to Roster  Link to County of Origin
Company A
Company B
Company C
Company D
Company E
Company F
Company G
Company H
Company I
Company K
Detroit, Michigan (Also known as Detroit Jackson Guards)
Cook County (Also known as Montgomery Guards)
Cook County (Also known as Jackson Guards)
LaSalle County (Also known as Earlville Guards and Earl Rifles)
Cook County (Also known as Ottawa Guards)
Cook & LaSalle counties (Also known as La Salle Guards)
Cook County (Also known as Mahoney Guards)
Cook & LaSalle counties (Also known as Ottawa Guards)
Cook County (Also known as Shields Guards)
Cook County (Also known as Shields Guards)

23rd (Consolidated) Illinois Infantry Regiment 
Consolidated into Battalion of 5 Companies, August 29, 1864
Additional Companies of Recruits added, April 1865
Consolidated Organization
23rd Infantry Field & Staff
Non-Commissioned Staff
Unassigned Recruits
 
The Consolidated Regiment did not have a Band
or Unassigned/Substitute/Drafted Recruits

Link to Roster 
Link to County of Origin 
Company A (Consolidated)
Company B (Consolidated)
Company C (Consolidated)
Company D (Consolidated)
Company E (Consolidated)
Company F (Consolidated)
Company G (Consolidated)
Company H (Consolidated)
Company I (Consolidated)
Company K (Consolidated)
consolidated
consolidated
consolidated
consolidated
consolidated
Cook County
Assorted counties
Cook County
Cook & Kendall counties
Cook County

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