Organized at Aurora, Ill., as Company "B" Cavalry, 36th Illinois Infantry, and mustered in September 23, 1861. Moved to St. Louis, Mo., thence to Rolla, Mo., September 24-29 and duty there until January, 1862. Attached to Army of the West to January, 1862. 2nd Brigade, Army of Southwest Missouri, to February, 1862. 2nd Brigade, 1st Division, Army of Southwest Missouri, to June, 1862. Cavalry, Army of Mississippi, to September, 1862. 9th Division, Army Ohio, to October, 1862. 9th Division, 3rd Army Corps, Army Ohio, to November, 1862. Headquarters Right Wing 14th Army Corps to December, 1862.

SERVICE - Expedition against Freeman's forces November 1-9, 1861. Curtis' Campaign against Price in Missouri and Arkansas February and March, 1862. Advance to Springfield, Mo., February 2-13. Pursuit of Price into Arkansas February 14-29. Battles of Pea Ridge, Ark., May 6-8. At Keytesville until April 5. March to Batesville April 5-May 3. Moved to Cape Girardeau, Mo., May 11-22, thence to Hamburg Landing, Tenn., May 23-29. Occupation of Corinth, Miss., May 30. Pursuit to Booneville May 30-June 6. Duty at Rienzi until September 6. Moved to Covington, Ky., thence to Louisville, Ky., September 6-19. Pursuit of Bragg into Kentucky October 1-16. Battle of Perryville, Ky., October 8. Lancaster, Ky., October 16. March to Nashville, Tenn., October 16-November 7. Expedition from Edgefield to Harpeth Shoals and Clarksville November 25-December 1. Clarksville November 25. Advance on Murfreesboro, Tenn., December 26-30. Nolinsville, Knob Gap, November 26. Battle of Stone River, Tenn., December 30-31, 1862, and January 1-3, 1863. Company assigned to 15th Illinois Cavalry as Company K, December 25, 1862.