United States Regiments & Batteries > Illinois

The 12th Illinois Cavalry Regiment lost 38 enlisted men killed or mortally wounded and 4 officers and 192 enlisted men to disease during the Civil War.

The regiment is honored by a  monument at Gettysburg.

December 31 Captain Gilmore’s Company of Cavalry, Company A, 32nd Illinois, organized at Camp Butler and assigned as Company F
February 24 Companies A, B, C, D, E and G organized at Springfield, Ill., and mustered in
February – June Duty at Camp Butler, Ill., guarding prisoners
June 25 Ordered to Martinsburg, W. Va.; Attached to District of Martinsburg, W. Va.; Duty at Martinsburg, W. Va., and on the Upper Potomac
September 3 Near Martinsburg; Attached to 1st Brigade, 2nd Division, 12th Army Corps, Army Potomac
September 3-4 Bunker Hill
September 6 Martinsburg
September 7 Darkesville
September 11 Williamsport, Md.
September 11-12 Martinsburg
September 13-14 Defense of Harper’s Ferry, W. Va.
Night of
September 14
Regiment cut its way out through enemy’s lines from the Harper’s Ferry siege
September 16-18 Antietam, Md.
September 20 Hagerstown, Md.; Duty on Upper Potomac
September 21 Williamsport
October Attached to Defenses Upper Potomac, 8th Army Corps, Middle Dept.
October 10 McCoy’s or Russell’s Ferry and near Green Springs Furnace
November 9 Reconnaissance from Bolivar Heights to Rippon, W. Va.
December 26-27 Dumfries, Va.
Dec. 28 At Falmouth, Va.


February Attached to 2nd Brigade, 3rd Division, Cavalry Corps, Army of the Potomac
April 27 – May 8 Chancellorsville Campaign
April 29-May 8 Stoneman’s Raid
May 4 Tunstall Station
May 5 Aylett’s
May 19-23 Raid from Yorktown into Matthews County
June, 1863 Attached to 1st Brigade, 1st Division, Cavalry Corps, Army Potomac
June 9 March to Falmouth, Va., Brandy Station and Beverly Ford
June 21 Upperville
June 23-28 Expedition from Yorktown to South Anna Bridge (Detachment)
June 26 South Anna Bridge (Detachment)
July 1-3
Battle of Gettysburg

The regiment had parts of five companies at Gettysburg and was combined with the 3rd Indiana Cavalry under the command of Colonel George H. Chapman. The combined regiments totaled 588 men and lost 4 killed, 10 wounded and 6 missing.From the monument:

First line of battle July 1, 1863. Held until relieved by 1st Corps. One Squadron picketing ridge east of Marsh creek met enemy’s left advance.

Killed: Ferdinand Ushuer, Thos. G. Blanset, John Ellis, Gabriel B. Durham, Homer C. Stedman,

Regiment retired to ridge on left rear. With brigade fought dismounted, repulsing attacks of the enemy. Covered the withdrawal of line to Cemetery Hill, and in the evening took position on left flank of the army.

July 2, 1863, Buford’s Division retired toward Westminster.

July 6 Williamsport, Md.
July 8 Boonsboro
July 9 Benevola or Beaver Creek
July 10-13 At and near Funkstown
July 14 Falling Waters
July 26 Chester Gap
July 31 – August 1 Kelly’s Ford
August 1-4 Brandy Station
August 6 Near Fairfax Court House (Detachment)
September 7-8 Brandy Station and Culpeper Court House
September 12 Near Bristoe Station
September 13-17 Advance from the Rappahannock to the Rapidan
September 13 Culpeper Court House
September 14-16 Raccoon Ford
September 17 Stevensburg
September 21-23 Reconnaissance across the Rappahannock
September 22 Jack’s Shop, Madison Court House
October 9-22 Bristoe Campaign
October 10 Raccoon and Morton’s Fords
October 11-12 Brandy Station
October 15 Oak Hill
October 27 Rappahannock Station
November 20-28 Moved to Chicago, Ill.
December 30-
January 12
Companies K, L and M organized at Springfield, Ill.
February Attached to District of St. Louis, Mo., Dept. of Missouri
February 9 Moved to St. Louis, Mo.
March Attached to 1st Brigade, Cavalry Division, 19th Army Corps, Dept. of the Gulf
March 15 –
April 1
Moved to New Orleans, La.
April 20 Moved to Red River
April 23 Arrived at Alexandria
April 28-May 5-8 Actions at Alexandria
May 5-8 Bayou Teche, La.
May 14 Wilson’s Landing
May 15 Avoyelle’s or Marksville Prairie
May 16 Mansura
May 17 Yellow Bayou
May 20 Morganza
June 1 Arrived at New Orleans, La.; District of LaFourche, Dept. of the Gulf
June 11 Moved to Napoleonville, engaged in picketing and scouting
July 29 Near Napoleonville (Co. L)
August, 1864 Attached to 4th Brigade, Cavalry Division, Dept. of the Gulf,
then 3rd Brigade, Cavalry Division, Dept. of the Gulf
August 15-21 Expedition from Paincoursville to Natchez, Miss. with skirmish (Cos. I, L)
September 7-11 Expedition to Grand Lake, Grand River and Lake Natchez
September 26-30 Expedition from Napoleonville to Grand River and Bayou Pigeon
November 1 Moved to Baton Rouge, La., and duty there
November 18 Liberty
November 27 – December 13 Davidson’s Expedition against Mobile and Ohio R. R.
December 23-24 Expedition from Baton Rouge to Clinton
January 7-26 Moved to Vicksburg, Miss., thence to Memphis, Tenn., and to Gaines’ Landing, Ark.
January 27 –
February 14
Osban’s Expedition through Southern Arkansas and Northern Louisiana;
Attached to 2nd Brigade, Cavalry Division, District of West Tennessee; Duty near Memphis, Tenn.
March 3-11 Expedition from Memphis, Tenn., into Northern Mississippi
June 15-22 Moved to Alexandria, La.
July, 1865 Dept. of Texas
August 8-26 Marched to Hempstead, Texas
August 1865 Duty in Eastern Texas
May 29 Mustered out