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.
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1861
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| December 31 | Captain Gilmore’s Company of Cavalry, Company A, 32nd Illinois, was organized at Camp Butler and assigned as Company F |
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1862
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| February 24 | Companies A, B, C, D, E and G were organized at Springfield, Illinois 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, Maryland |
| 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 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. |
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1863 |
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| 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 GettysburgThe 12th Illinois Cavalry 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, Maryland. |
| 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, Illinois |
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1864
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| 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 |
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1865
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| January 7-26 | Moved to Vicksburg, Miss., then 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 |
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1866
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| May 29 | The 12th Illinois Cavalry Regiment mustered out |