Organized at Athens, Ohio, August 16 to September 28, 1861. Moved to Camp Dennison, Ohio, and organization there completed November 4, 1861. Moved to Louisville, Ky., November 6, thence to Elizabethtown, Ky., November 15. Attached to 8th Brigade, Army of the Ohio to December, 1861. 8th Brigade, 3rd Division, Army of the Ohio, to July, 1862. Unattached, Railroad Guard, Army Ohio, to September, 1862. 29th Brigade, 8th Division, Army Ohio, to November, 1862. 2nd Brigade, 2nd Division, Center 14th Army Corps, Army of the Cumberland, to January, 1863. 2nd Brigade, 2nd Division, 14th Army Corps, to October, 1863. 2nd Brigade, 1st Division, 14th Army Corps, to November, 1863. Engineer Brigade, Dept. of the Cumberland, to November, 1864.
SERVICE.-Duty at Elizabethtown and Bacon Creek, Ky., November, 1861, to February, 1862. Advance on Bowling Green, Ky., February 10-15, and on Nashville, Tenn., February 18-25. Occupation of Nashville, Tenn., February 25-March 18. Reconnoissance to Shelbyville, Tullahoma and McMinnville March 25-28. To Fayetteville April 7. Expedition to Huntsville, Ala., April 10-11. Capture of Huntsville April 11. Advance on and capture of Decatur April 11-14. Operations near Athens, Limestone Bridge, Mooresville and Elk River May 1-2. Near Pulaski and near Bridgeport May 1. Moved to Fayetteville May 31. Negley's Expedition to Chattanooga June 1-15. At Battle Creek till July 11. Guard duty along Tennessee & Alabama Railroad from Tullahoma to McMinnville till September. Short Mountain Road and McMinnville Augiist 29 (Cos. "A" and "I"). Retreat to Nashville, Tenn. Siege of Nashville September 12-November 7. Near Lavergne October 7. Duty at Nashville till December 26. Advance on Murfreesboro December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty at Murfreesboro till June. Middle Tennessee or Tullahoma Campaign June 23-July 7. Occupation of Middle Tennessee till August 16. Passage of Cumberland Mountains and Tennessee River and Chickamauga (Ga.) Campaign August 16-September 22. Davis Cross Roads or Dug Gap September 11. Battle of Chickamauga September 19-21. Rossville Gap September 21. Siege of Chattanooga, Tenn., September 24-November 23. Re-opening Tennessee River October 26-29. Brown's Ferry October 27. Chattanooga-Ringgold Campaign November 23-27. Orchard Knob November 23-24. Mission Ridge November 25. Engaged in Engineer duty at Chattanooga till October 20, 1864. Mustered out November 9, 1864.
Regiment lost during service 4 Officers and 72 Enlisted men killed and mortally wounded and 1 Officer and 107 Enlisted men by disease. Total 184.
