12th Illinois Cavalry Regiment
Three Year Service
February 24, 1862 - May 29, 1866
(The 4th Cavalry Regiment consolidated with the 12th on June 14, 1865)

Army of the Potomac: Sep 1862 - Nov 1863
Department of the Gulf: Mar 1864 - Feb 1865
Department of Texas: July 1865 - May 1866

Battles/Campaigns Engaged in:

Harpers Ferry, Chancelorsville Campaign[Stoneman's Raid], Gettysburg

(McClellan Dragoons, later 12th Cav, Co. H and I): Penninsula Campaign, Seven Days, Antietam, Fredericksburg

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

Original Organization
12th Cavalry Field & Staff
Non-Commissioned Staff
Unassigned Recruits
 
This Regiment did not have a Band

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 H

Company I
Company K
Company L
Company M
Cook & Winnebago counties
Cook County
Du Page & Cook counties
Cook County
Kankakee & Cook counties
Greene County (Also Known as Gilmore's Cavalry Company)
Hancock & Cook counties
(Originally attached to 52d Infantry, assigned to Co. H, 12th Ill. Cav.,
subsequently assigned as Co. G, 15th Ill. Cav.)
Cook County (Also Known as Barker's Dragoons, Gilbert's Cavalry Company, McClellan Dragoons)
(formerly Co. A, McClellen Dragoons)
Cook County (Also Known as Barker's Dragoons, McClellan Dragoons)
Cook County
Warren County
Cook County

12th (Consolidated) Illinois Cavalry Regiment
Consolidated into Battalion of 8 Companies, January 1865
Consolidated with 5 Companies from 4th Cavalry, June 1865

Consolidated Organization
12th Cavalry Field & Staff
Non-Commissioned Staff
Unassigned Recruits
 
The Consolidated Regiment did not have a Band

Link to Roster 
Company A (Consolidated)
Company B (Consolidated)
Company C (Consolidated)
Company D (Consolidated)
Company E (Consolidated)
Company F (Consolidated)
Company G (Consolidated)
Company G (Consolidated)
(formerly Co. A, 4th Illinois Cavalry)
Company H (Consolidated)
Company I (Consolidated)
Company K (Consolidated)
Company L (Consolidated)
Company M (Consolidated)

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