Organized at Camp Butler, Ill., and mustered in November 25, 1861. Moved to Quincy, Ill., December 20, thence to Benton Barracks, Mo., March 13, 1862. Moved to Springfield, Mo., April 4. Attached to District of Southwest Missouri, Dept. of Missouri, to October, 1862. 1st Brigade, 3rd Division, Army of the Frontier, Dept. of Missouri, to December, 1862. Unattached, Army of the Frontier, to February, 1863. 1st Brigade, 2nd Division, Army of the Frontier, to May, 1863. 2nd Brigade, 1st Cavalry Division, District of Southeast Missouri, to August, 1863. 2nd Brigade, 1st Cavalry Division, Arkansas Expedition, to December, 1863. 3rd Brigade, 1st Cavalry Division, Army of Arkansas, to January, 1864. 3rd Brigade, 1st Cavalry Division, 7th Army Corps, Dept. of Arkansas, to May, 1864. 3rd Brigade, 2nd Division, 7th Army Corps, to September, 1864. 3rd Brigade, Cavalry Division, 7th Army Corps, to February, 1865. 1st Brigade, Cavalry Division, 7th Army Corps, to April, 1865. 1st Brigade, 1st Cavalry Division, Military Division West Mississippi. to May, 1865. 2nd Brigade, 2nd Cavalry Division, Military Division West Mississippi, to July, 1865. Dept. of Texas to November, 1865.

SERVICE:
Near Waynesville, Mo., May 31, 1862 (Co. "K"). Neosho May 31. Expedition to Keittsville, Mo., July 8-20. Near Fayetteville, Ark., July 15. Moved to Vera Cruz August 10, to Marshfield August 16, and duty there, operating from Springfield to Cane Hill, Ark., till November 13. Marshfield, Mo., October 20 (Detachment). Clark's Mills, Douglass County, November 7 (Co. "C"). Battle of Prairie Grove, Ark., December 7. 3rd Battalion (Cos. "C," "F," "I" and "M") moved to Fayetteville, Ark., December 8, and duty there till March, 1863, rejoining Regiment in Missouri. Expedition over Boston Mountains to Van Buren December 27-29, 1862 (Cos. "B," "E," "H" and "L"). 2nd Battalion (Cos. "B," "E," "H" and "L") moved to Huntsville January, 1863, and joined Totten. Moved to Flat Creek February, 1863, thence to Rolla, Mo. Scout from Fayettevilie to Van Buren January 23-27, 1863 (3rd Battalion). Mulberry Springs January 27. Scout from Fayetteville to Arkansas River February 5-12 (3rd Battalion). Thelkelds' Ferry February 6. Near Van Buren February 10. Operations against Marmaduke April 17-May 2. Jackson April 26. At Pilot Knob till July. Steele's Campaign against Little Rock July 1-September 10. Bayou Metoe, or Reed's Bridge, August 27. Bayou Fourche and capture of Little Rock September 10. Pursuit of Price September 11-13. Near Little Rock September 11. Duty at Little Rock till March, 1864. Steele's Expedition to Camden March 23-May 3. Elkin's Ferry April 3-4. Prairie D'Ann April 9-13. Jenkins' Ferry, Camden, April 15. Near Camden April 20. Jenkins' Ferry, Saline River, April 30. Operations against Shelby north of the Arkansas River May 13-31. Scouts from Huntersville and Clinton June 4-17. Operations in Arkansas July 1-31. Near Huntersville July 8 (Detachment). Near Little Rock July 10 (Detachment). Bayou des Arc July 14. Duty at Little Rock, Pine Bluff and Brownsville and in the Dept. of Arkansas to November, 1865. Expedition from Little Rock to Little Red River August 6-16, 1864. Expedition from Little Rock to Searcy, Fairview and Augusta in pursuit of Shelby August 27-September 6, 1864. Expedition from Pine Bluff September 9-12. Near Monticello September 10 (Detachment). Brewer's House September 11 (Detachment). Expedition from Brownsville to Cotton Plant October 26-November 2 (Detachment). Expedition from Brownsville to Fairview November 28-December 3. Duty in Arkansas till June 6, 1865. Moved to Shreveport, La., June 6-17, thence marched to San Antonio, Texas, July 3-August 1; duty there till November, 1865.

1st Battalion (Cos. "A," "D," "G" and "K") detached and ordered to join Gen. Curtis June 15, 1862. Reported at Jacksonport, Ark., July 4, 1862. Attached to Army of Southwest Missouri and District of Eastern Arkansas to December, 1862. 1st Brigade, 2nd Cavalry Division, 13th Army Corps, Dept. of the Tennessee, to May, 1863. Detached Brigade, District of Northeast Louisiana to June, 1863. Unattached, 13th Army Corps, to July, 1863.

SERVICE:
March to Helena, Ark., July 4-12, 1862. Action at Cotton Plant, Ark., July 7. Moved to Oldtown Landing August 6, and duty there till October. Moved to Helena October 6. Expedition to mouth of White River November 16-20. Washburn's Expedition to Oakland, Miss., November 27-December 7. Oakland December 3. Arkansas Post, Ark., January 11, 1863. Yazoo Pass Expedition February 24-April 8, 1863. Siege operations against Vicksburg, Miss., April to July. Near Richmond, La., June 6. Milliken's Bend and Young's Point, La., June 6-7. Expedition from Young's Point to Richmond June 14-16. Richmond June 16. Moved to Helena, Ark., July, and rejoined Regiment near Wittsburg, Ark., August 1, 1863. Regiment mustered out November 22, 1865.

Regiment lost during service 1 Officer and 24 Enlisted men killed and mortally wounded and 3 Officers and 262 Enlisted men by disease. Total 290.