Organized at Decatur, Ill., and mustered in August 5, 1861. Moved to St. Louis, Mo., August 8, 1861, thence to Bird's Point, Mo., August 29, and to Paducah, Ky., September 8. Attached to District of Cairo to December, 1861. 1st Brigade, 2nd Division, District of Cairo, to February, 1862. 1st Brigade, 4th Division, District of West Tennessee and Army of the Tennessee, to July, 1862. 1st Brigade, 4th Division, District of Memphis, to September, 1862. 1st Brigade, 4th Division, District of Jackson, to November, 1862. 1st Brigade, 4th Division, Right Wing 13th Army Corps (Old), Dept. of the Tennessee to December, 1862. 1st Brigade, 4th Division, 17th Army Corps, Army of the Tennessee to January, 1863. 1st Brigade, 4th Division, 16th Army Corps, to July, 1863. 1st Brigade, 4th Division, 13th Army Corps to August, 1863. 1st Brigade, 4th Division, 17th Army Corps, to March, 1864. 1st Brigade, Provisional Division, 17th Army Corps, Dept. of the Gulf, to June, 1864 (Non-Veterans). 4th Brigade, 1st Division, 16th Army Corps, to August, 1864 (Non-Veterans). 2nd Brigade, 4th Division, 17th Army Corps, to November, 1864. 1st Brigade, 4th Division, 17th Army Corps, to December, 1864.
SERVICE - Duty at Paducah, Ky. (Cos. "B" and "I," at Smithland, Ky.), till February, 1862. Demonstration on Columbus, Ky., November 7-9, 1861. Operations against Forts Henry and Heiman, Tenn., February 3-6. Fort Heiman February 7. Investment and capture of Fort Donelson, Tenn., February 12-16. Expedition to Clarksville, Tenn., February 19-21. Moved to Pittsburg Landing, Tenn., March 10-16. Battle of Shiloh, Tenn., April 6-7. Advance on and siege of Corinth, Miss., April 29-May 30. March to Memphis, Tenn., via LaGrange, Grand Junction. Holly Springs and Germantown, June 1-July 21. Duty there till September 6. Moved to Bolivar, Tenn. March to relief of Corinth October 4. Battle of Hatchie River or Metamora, October 5. Pursuit to Ripley October 5-12. Grant's Central Mississippi Campaign, November 2, 1862, to January 10, 1863. Reconnoissance from LaGrange to Lamar, Miss., November 5, 1862. Worsham Creek November 16. Guard R. R. at Moscow, Tenn., January to March, 1863. Skirmish at Moscow February 18 (Detachment). Moved to Memphis, Tenn., March, and duty there till May. Expedition to the Coldwater, Miss., April 18-24. Hernando April 18. Coldwater April 19. Moved to Vicksburg, Miss., June 12-22. Siege of Vicksburg June 22-July 4. Surrender of Vicksburg July 4. Advance on Jackson, Miss., July 5-10. Siege of Jackson, July 10-17. Assault on Jackson July 12. At Vicksburg till November. Moved to Natchez, Miss., November 18 and return to Vicksburg, December 16. Duty there till February, 1864. Meridian Campaign February 3-March 2. Pearl River February 27. Veterans on furlough March to May, 1864. Non-Veterans on Red River Campaign March 10-May 22. Fort DeRussy March 14. Battle of Pleasant Hill, La., April 9. Pleasant Hill Landing April 12-13. About Cloutiersville April 22-24. At Alexandria April 30-May 13. Boyce's Plantation May 6. Well's Plantation May 6. Bayou Boeuf May 7. Retreat to Morganza May 13-22. Mansura May 16. Yellow Bayou May 18. Moved to Vicksburg, thence to Memphis, Tenn., May 22-June 10. Action at Lake Chicot, Ark., June 6-7. Smith's Expedition to Tupelo, Miss., July 5-21. Harrisburg near Tupelo July 14-15. Smith's Expedition to Oxford, Miss., August 1-30. Veterans moved to Cairo, Ill., thence to Nashville, Tenn., and to Tunnel Hill May, 1864. Assigned to duty guarding R. R. at Tunnel Hill, Moon Station, Big Shanty, Marietta and Kenesaw Mountain till November. March to the sea November 15-December 10. Siege of Savannah December 10-21.
Consolidated with 53d Illinois Infantry December 23, 1864.
Regiment lost during service 8 Officers and 107 Enlisted men killed and mortally wounded and 3 Officers and 107 Enlisted men by disease. Total 225.