Organized at Keokuk March 21 to April 16, 1862, and mustered in April 16, 1862. Left State for St. Louis, Mo., April 19. Attached to 2nd Brigade, 3rd Division, Army of Mississippi, to November, 1862. 2nd Brigade, 7th Division, Left Wing 13th Army Corps (Old), Dept. of Tennessee, to December, 1862. 2nd Brigade, 7th Division, 16th Army Corps, to January, 1863. 2nd Brigade, 7th Division, 17th Army Corps, to September, 1863. 2nd Brigade, 2nd Division, 17th Army Corps, to December, 1863. 2nd Brigade, 3rd Division, 15th Army Corps, to April, 1865. 3rd Brigade, 2nd Division, 15th Army Corps, to July, 1865.
Duty at Benton Barracks, Mo., till May 5, 1862. Moved to Hamburg Landing, Tenn., May 5-7. Advance on and siege of Corinth, Miss., May 8-30. Action on Corinth Road May 29. Pursuit to Booneville May 31-June 12. Camp at Clear Creek, near Corinth, till August 15. Expedition to Ripley, Miss., June 27-July 1. Moved to Jacinto August 15, and duty there till October 2. Expedition to Iuka, Miss., September 18-20. Battle of Iuka September 19. Moved to Corinth October 2. Battle of Corinth October 3-4. Pursuit to Ripley October 5-13. Grant's Central Mississippi Campaign November 2, 1862, to January 10, 1863. Duty at Bray's Station guarding Memphis & Charleston Railroad till February 8. March to Memphis, thence moved to Helena, Ark., March 2-3. Yazoo Pass Expedition and operations against Fort Pemberton and Greenwood March 13-April 5. Moved to Richmond, La., April 17-20. Movement on Bruinsburg and turning Grand Gulf April 25-30. Battles of Port Gibson May 1; Raymond May 12; Jackson May 14; Champion's Hill May 16; Big Black River Crossing May 17. Siege of Vicksburg, Miss., May 18-July 4. Assaults on Vicksburg May 19 and 22. Fort Hill Bastion June 25. Surrender of Vicksburg July 4, and occupation of that city till September 9. Moved to Helena, Ark., September 9; thence to Memphis, Tenn., September 29, and march to Chattanooga, Tenn., October 10-November 19. Battles of Chattanooga November 23-25; Tunnel Hill November 23-24; Mission Ridge November 25. Pursuit to Graysville November 26-27. Provost and guard duty at Huntsville, Ala., December 22, 1863, to June, 1864. (Veterans on furlough April and May.) At Tilton, Ga., July 2 to October 13. Attack on Tilton October 13. Regiment captured. Remnant joined Sherman at Savannah, Ga., January, 1865. Campaign of the Carolinas January to April, 1865. Salkehatchie Swamps, S. C., February 3-5. South Edisto River February 9. North Edisto River February 12-13. Columbia February 15-17. Lynch's Creek February 25-26. Cox's Bridge, N.C., March 19-20. Battle of Bentonville March 20-21. Occupation of Goldsboro March 24. Advance on Raleigh April 9-13. Occupation of Raleigh April 14. Bennett's House April 26. Surrender of Johnston and his army. March to Washington, D. C., via Richmond, Va., April 29-May 20. Grand Review May 24. Moved to Louisville, Ky., June. Mustered out July 25, 1865.
Regiment lost during service 5 Officers and 66 Enlisted men killed and mortally wounded and 2 Officers and 121 Enlisted men by disease. Total 194.