15th Regiment Infantry (3 Months). Organized at Columbus, Ohio, April 27, 1861. Moved to Zanesville, Ohio, May 8, thence to West Virginia. Duty on the Baltimore & Ohio Railroad and operations in the vicinity of Philippi, Laurel Hill and Carrick's Ford June 3-July 16. Action at Bowman's Place June 29. Ordered to Columbus, Ohio, and mustered out August 27-31, 1861.

15th Regiment Infantry (3 Years). Organized at Mansfield, Ohio, September, 1861. Moved to Camp Dennison, Ohio, September 26, thence to Lexington, Ky., October 4. Duty at Camp Nevin, Ky., October 14-December 9, 1861. Attached to McCook's Command at Nolin October to November, 1861. 6th Brigade, Army of the Ohio, to December, 1861. 6th Brigade, 2nd Division, Army Ohio, to September, 1862. 6th Brigade, 2nd Division, 1st Army Corps, Army Ohio, to November, 1862. 1st Brigade, 2nd Division, Right Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 1st Brigade, 2nd Division, 20th Army Corps, Army of the Cumberland, to October, 1863. 1st Brigade, 3rd Division, 4th Army Corps, to August, 1865. Dept. of Texas to November, 1865.

Regimental Moderators/Historians: Robert Bundy