Organized at Rockford, Ill., and mustered in September 6, 1862. Moved to Cincinnati, Ohio, October 8-10, 1862. Attached to 2nd Brigade, 3rd Division, Army of Kentucky, Dept. of the Ohio, to February, 1863. 2nd Brigade, Baird's 3rd Division, Army of Kentucky, Dept. of the Cumberland, to June, 1863. 1st Brigade, 1st Division, Reserve Corps, Army of the Cumberland, to October, 1863. 3rd Brigade, 1st Division, 4th Army Corps, October, 1863. 2nd Brigade, 1st Division, 4th Army Corps, to June, 1865.Moved to Covington, Ky., October 10, 1862, and duty there till October 29. Operating against Kirby Smith's threatened attack on Cincinnati, Ohio (Cos. "A," "E," "F," "G" and "H" escort train to Lexington, Ky., October 19-25). Moved to Lexington, Ky., October 29-November 6. Duty at Lexington till November 14 and at Harrodsburg, Ky., till November 28. (Cos. "A" and "E" at Lexington till January, 1863.) Moved to Danville November 28 and duty there till January 26, 1863. Pursuit of Morgan to Lebanon Junction December 26-31, 1862. Moved to Louisville, Ky., January 26-31, thence to Nashville, Tenn., January 31-February 8. Repulse of Wheeler's attack on Fort Donelson, Tenn., February 4. At Nashville till March 5. Moved to Franklin, Tenn., and pursuit of Van Dorn March 5-12. Spring Hill March 10. At Brentwood March 27-April 8. Return to Franklin April 8, and repulse of Van Dorn's attack April 10. At Franklin till June 2. Moved to Triune June 2. Action at Triune with Wheeler June 11. Middle Tennessee or Tullahoma Campaign June 24-July 7. At Wartrace July 3 to August 12, and at Elk River near Estill Springs till September 7. Chickamauga (Ga.) Campaign September 7-22. Ringgold September 17. Spring Creek September 18. Battle of Chickamauga September 19-20. Moved to Moccasin Point September 23 and duty there till November 1, and at Shellmound till November 20. Chattanooga-Ringgold Campaign November 23-27. Lookout Mountain November 23-24. Mission Ridge November 25. Taylor's Ridge, Ringgold Gap, November 27. At Lookout Mountain till December 1. At Nickajack Cove till January 26, 1864. Duty on East Tennessee R. R. till February 22. Demonstration on Dalton, Ga., February 22-27. Tunnel Hill, Buzzard's Roost Gap and Rocky Faced Ridge February 23-25. At Cleveland, Tenn., March 1-April 22. Atlanta (Ga.) Campaign May 1-September 8. Tunnel Hill May 6-7. Demonstration on Rocky Faced Ridge May 8-11. Buzzard Roost Gap May 8-9. Demonstration on Dalton May 11-13. Battle of Resaca May 14-15. Near Kingston May 18-19. Near Cassville May 19. Advance on Dallas May 22-25. Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5. Operations about Marietta and against Kenesaw Mountain June 10-July 2. Pine Hill June 11-14. Lost Mountain June 15-17. Assault on Kenesaw June 27. Ruff's Station, Smyrna Camp Ground, July 4. Chattahoochie River July 5-17. Peach Tree Creek July 19-20. Siege of Atlanta July 22-August 25. Flank movement on Jonesboro August 25-30. Battle of Jonesboro August 31-September 1. Lovejoy Station September 2-6. Operations against Hood in North Georgia and North Alabama September 28-November 3. Nashville Campaign November-December. Columbia, Duck River, November 24-27. Battle of Franklin November 30. Battle of Nashville December 15-16. Pursuit of Hood to the Tennessee River December 17-28. Moved to Huntsville, Ala., and duty there till March, 1865. Expedition to Bull's Gap and operations in East Tennessee March 20-April 22. Moved to Nashville, Tenn., and duty there till June. Mustered out June 10, 1865.Regiment lost during service 5 Officers and 111 Enlisted men killed and mortally wounded and 1 Officer and 124 Enlisted men by disease. Total 241.