The 23rd Kentucky Infantry Regiment was organized at Camp King in Covington, Kentucky and mustered in for a three-year enlistment on January 2, 1862, under the command of Colonel Marcellus Mundy.
The regiment was attached to District of Kentucky, Department of the Ohio, to March 1862.
10th Brigade, 4th Division, II Corps, Army of the Ohio, to November 1862.
3rd Brigade, 2nd Division, Left Wing, XIV Corps, Army of the Cumberland, to January 1863.
3rd Brigade, 2nd Division, XXI Corps, Army of the Cumberland, to October 1863.
The regiment did garrison and guard duty in southern Kentucky and middle Tennessee from January to August 1862.
It them marched to Louisville, Kentucky, in pursuit of Bragg, September 1–26.
March to Nashville, Tennessee, October 17-November 7, and duty there until December 26.
Passage of Cumberland Mountains and Tennessee River and Chickamauga Campaign August 16-September 22.
Regiment veteranized at Blain's Cross Roads, Tenn., January 5, 1864.
Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5.
Ruff's Station, Smyrna Camp Ground, July 4.
Expedition to Bull's Gap and operations in eastern Tennessee March 15-April 22.
Ordered to New Orleans, June 6; thence moved to Texas July.
Duty at Indianola, Green Lake and Victoria until December.