Organized at Iowa City and Montezuma August and September, 1861. Ordered to St. Louis, Mo., September 6; thence to Cape Girardeau, Mo., October 1. Attached to District of Cairo October, 1861. 5th Brigade, Military District of Cairo, to February, 1862. 4th Brigade, 1st Division, District of Cairo, February, 1862. 2nd Brigade, 2nd Division, Army of Mississippi, to April, 1863. 2nd Brigade, 3rd Division, Army of Mississippi, to April, 1862. 1st Brigade, 3rd Division, Army of Mississippi, to May, 1862. 2nd Brigade, 3rd Division, Army of Mississippi, to November, 1862. 3rd Brigade, 7th Division, Left Wing 13th Army Corps (Old), Dept. of Tennessee, to December, 1862. 3rd Brigade, 7th Division, 16th Army Corps, to January, 1863. 3rd Brigade, 7th Division, 17th Army Corps, to September, 1863. 3rd Brigade, 2nd Division, 17th Army Corps, to December, 1863. 3rd Brigade, 3rd Division, 15th Army Corps, to August, 1864. 2nd Brigade, 3rd Division, 15th Corps, to April, 1865. 1st Brigade, 2nd Division, 15th Corps, to August, 1865.
At Cape Girardeau, Mo., till November, 1861. Expedition against Thompson's forces November 2-12. Action at Bloomfield November 10. Moved to Bird's Point, Mo., November 12. Action at Charleston January 8, 1862. Moved to New Madrid, Mo., March 4. Operations against New Madrid, Mo., March 6-15, and against Island No. 10 March 15-April 8. Pursuit and capture at Tiptonville April 8. Expedition to Fort Pillow, Tenn., April 13-17. Moved to Hamburg Landing, Tenn., April 18-22. Advance on and siege of Corinth, Miss., April 29-May 30. Actions at Farmington May 9 and 26. Occupation of Corinth and pursuit to Booneville May 30-June 12. At Clear Creek till July 29. Moved to Jacinto July 29. Expedition to Iuka September 18-19. Battle of Iuka September 19. Moved to Corinth October 1. Battle of
Corinth October 3-4. Pursuit to Ripley October 5-12. Grant's Central Mississippi Campaign November, 1862, to January, 1863. Reconnoissance to Holly Springs November 8-9, 1862. Duty near Memphis guarding Memphis & Charleston Railroad January to March, 1863. Yazoo Pass Expedition and operatidns against Fort Pemberton and Greenwood March 13-April 5. Moved to Milliken's Bend, La., April 13. Movement on Bruinsburg and turning Grand Gulf April 25-30. Battle of Port Gibson May 1. South Fork of Bayou Pierrie May 2. Battles of Raymond May 12. Near Raymond May 13. Jackson May 14. Champion's Hill May 16.
Big Black River May 17. Siege of Vicksburg May 18-July 4. Assaults on Vicksburg May 19 and 22. Surrender of Vicksburg July 4 and duty there till September 13. Moved to Memphis, thence march to Chattanooga, Tenn., September 13-November 20. Operations on Memphis & Charleston Railroad in Alabama October 20-29. Battles of Chattanooga November 23-25; Tunnel Hill November 23-24: Mission Ridge November 25. Pursuit to Graysville November 26-27. March to relief of Knoxville November 28-December 8. Duty at Bridgeport and Huntsville, Ala., till April 30, 1864. Moved to Decatur, Ala., April 30. Veterans on furlough June 15-August 1. Duty at Kingston, Ga., till November. Non-Veterans mustered out September 28, 1864. Operations against Wheeler October. March to the sea November 15-December 10. Siege of Savannah December 10-21. Campaign of the Carolinas January to April, 1865. Salkehatchie Swamps, S. C., February 3-5. Fishburn's Plantation, near Lane's Bridge, Salkehatchie, February 6. South Edisto River February 9. North Edisto River February 12-13. Congaree Creek February 15. Columbia February 16-17. 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 30. Grand Review May 24. Moved to Louisville, Ky., June. Duty there and at Little Rock, Ark., till August. Mustered out August 15, 1865.
Regiment lost during service 6 Officers and 95 Enlisted men killed and mortally wounded and 134 Enlisted men by disease. Total 235.