The 4th Kentucky Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. Service The 4th Kentucky Infantry Regiment was organized at Camp Dick Robinson and mustered in for a three-year enlistment on October 9, 1861, under the command of Colonel Speed Smith Fry. In February 1864, the regiment was reorganized at Lexington, Kentucky, as the 4th Regiment Kentucky Mounted Infantry. The regiment was attached to Thomas' Command, Army of the Ohio, to November 1861. 2nd Brigade, Army of the Ohio, to December 1861. 2nd Brigade, 1st Division, Army of the Ohio, to September 1862. 2nd Brigade, 1st Division, III Corps, Army of the Ohio, to November 1862. 2nd Brigade, 3rd Division, Center, XIV Corps, Army of the Cumberland, to January 1863. 2nd Brigade, 3rd Division, XIV Corps, to October 1863. 3rd Brigade, 3rd Division, XIV Corps, to June 1864. 1st Brigade, 1st Division, Cavalry Corps, Army of the Cumberland, to November 1864. 1st Brigade, 1st Division, Cavalry Corps, Military Division of Mississippi, to August 1865. The 4th Kentucky Infantry mustered out of service at Macon, Georgia, on August 17, 1865. Detailed service Moved to Crab Orchard, Kentucky, October 28, 1861, then to Lebanon, Kentucky, and duty there until January 1862. Advance on Camp Hamilton January 1–15. Action at Logan's Cross Roads on Fishing Creek January 19. Battle of Mill Springs January 19–20. Duty at Mill Springs until February 11. Moved to Louisville, Kentucky, then to Nashville, Tennessee, February 11-March 2. March to Savannah, Tennessee, March 20-April 7. Expedition to Bear Creek, Alabama, April 12–13. Advance on and siege of Corinth, Mississippi, April 29-May 30. Buell's Campaign in northern Alabama and middle Tennessee June to August. Action at Decatur August 7. March to Nashville, Tennessee, then to Louisville, Kentucky, in pursuit of Bragg August 20-September 26. Pursuit of Bragg into Kentucky October 1–16. Battle of Perryville October 8. March to Gallatin, Tennessee, and duty there until January 13, 1863. Operations against Morgan December 22, 1862 – January 2, 1863. Action at Boston December 29, 1862. Moved to Nashville, Tennessee, January 13, 1863, and duty there until June. Expedition toward Columbia March 4–14. Tullahoma Campaign June 24-July 7. Hoover's Gap June 24–26. Tullahoma June 29–30. Elk River July 3. Occupation of middle Tennessee until August 16. Passage of Cumberland Mountains and Tennessee River and Chickamauga Campaign August 16-September 22. Battle of Chickamauga, September 19–21.