Organized at Omaha June 11 to July 21, 1861. Attached to Dept. of Missouri to February, 1862. District of Cairo, Ill., February, 1862. 2nd Brigade, 3rd Division, Army of the Tennessee, to July, 1862. Helena (Ark.) District of Eastern Arkansas to October, 1862. 2nd Brigade, 2nd Division, Army of Southeast Missouri, Dept. of Missouri, to March, 1863. District of Southeast Missouri to November, 1863.

SERVICE:
Left State for St. Joseph, Mo., July 30, 1861; thence moved to Independence, Mo., August 3-5, and to St. Louis, Mo., August 8-11. Moved to Pilot Knob, Mo., August 13-14, and to Syracuse, Mo., August 19. Duty there till October 21. Fremont's Campaign against Springfield, Mo., October 21-November 2. March to Sedalia and Georgetown November 9-16. Campaign against Bushwhackers December 8-15. Pope's Expedition to Warrensburg and Milford December 15-27. Action at Shawnee Mound, Milford, on the Blackwater, December 18. (Capture of 1,300 prisoners.) Duty at Georgetown till February 2, 1862. Moved to Fort Donelson, Tenn., February 2-13. Investment and capture of Fort Donelson February 13-16. At Fort Henry February 17-March 6. Moved to Pittsburg Landing, Tenn., March 6-13. Battle of Shiloh , Tenn., April 6-7. Advance on and siege of Corinth, Miss., April 29-May 30. March to Memphis, Tenn., June 2-17; thence moved to Helena, Ark., July 24, and duty there till October. Expedition from Helena and capture of Steamer "Fair Play" August 4-19. Milliken's Bend August 18. Expedition up the Yazoo August 20-27. Haines Bluff August 20. Bolivar August 22. Greenville August 23. Moved to Sulphur Springs, Mo., October 5-11; thence to Pilot Knob October 28-30, and to Patterson November 2-4. Moved to Reeves Station December 9-10, and return to Patterson December 19. Moved to Van Buren December 21-24, and toward Doniphan January 9-10, 1863. Moved to Alton January 14-18; to West Plains and Salem, Ark., January 28-February 2. Moved to Pilot Knob and Ironton February 2-27. Moved to St. Genevieve and to Cape Girardoau March 8-12. Operations against Marmaduke April 21-May 2. Action at Cape Girardeau April 26. Pursuit of Marmaduke to St. Francis River April 29-May 5. Castor River, near Bloomfield, April 29. Bloomfield April 30. Chalk Bluffs, St. Francis River, April 30-May 1. Moved to Pilot Knob May 26-29 and duty there till August 28. At St. Louis, Mo., till November. Regiment ordered mounted October 11, 1863, and designation changed to 1st Nebraska Cavalry November 6, 1863 (which see).