De Villiers[2] in response to President Lincoln's call for 75,000 volunteers.
The regiment spent its entire service on duty at Camp Dennison until June 20, 1861.
[3] The 11th Ohio Infantry was reorganized at Camp Dennison on June 20, 1861, and mustered in for three years service under the command of Colonel A. H.
[4][5] The regiment was attached to Cox's Kanawha Brigade, West Virginia, to September 1861.
Benham's Brigade, District of the Kanawha, West Virginia, to October 1861.
1st Brigade, Kanawha Division, West Virginia, Department of the Mountains, to September 1862.
1st Brigade, Kanawha Division, IX Corps, Army of the Potomac, to October 1862.
1st Brigade, Kanawha Division, District of West Virginia, Department of the Ohio, to February 1863.
Crook's Brigade, Baird's Division, Army of Kentucky, Department of the Cumberland, to June 1863.
3rd Brigade, 4th Division, XIV Corps, Army of the Cumberland, to October 1863.
1st Brigade, 3rd Division, XIV Army Corps, to June 1865.
The regiment veteranized June 21, 1864, and was reorganized as a battalion, attached to the 92nd Ohio Infantry until January 1865.
Ordered to Nashville, Tenn., January 24, 1863, thence to Carthage February 22, and duty there until June.
Passage of Cumberland Mountains and Tennessee River and Chickamauga Campaign August 16-September 22.
Tunnel Hill, Buzzard's Roost Gap and Rocky Faced Ridge February 23–25.
Non-veterans relieved for muster out June 10 and ordered to Cincinnati, Ohio.
Veterans and recruits organized as a battalion and attached to 92nd Ohio Infantry until January 1865, participating in operations about Marietta, Ga., and against Kennesaw Mountain June 10-July 2, 1864.