The 13th Ohio Infantry Regiment organized at Columbus, Ohio, on April 20 – May 7, 1861, under Colonel Abram S. Piatt in response to President Lincoln's call for 75,000 volunteers.
Men who enlisted in the three-month regiment were mustered out August 14–25, 1861.
The 13th Ohio Infantry was reorganized at Camp Dennison and mustered in for three years service on June 22, 1861, under the command of Colonel William Sooy Smith.
[2] The regiment was attached to 2nd Brigade, Army of Occupation, Western Virginia, to September 1861.
Bonham's Brigade, District of the Kanawha, Western Virginia, to October 1861.
1st Brigade, Kanawha Division Western Virginia, to November 1861.
14th Brigade, 5th Division, II Corps, Army of the Ohio, to November 1862.
2nd Brigade, 3rd Division, Left Wing, XIV Corps, Army of the Cumberland, to January 1863.
2nd Brigade, 3rd Division, XXI Corps, Army of the Cumberland, to October 1863.
Sub-District of San Antonio, Central District of Texas, to December 1865.
After the three-year enlistments expired in June 1864, recruits and veterans who reenlisted were consolidated into a battalion of four companies.
The 13th Ohio Infantry mustered out of service at San Antonio, Texas, on December 5, 1865.
Operations in the Kanawha Valley and New River Region October 19 – November 16.
Buell's Campaign in northern Alabama and middle Tennessee June to August.
March to Louisville, Ky., in pursuit of Bragg August 21 – September 26.
Passage of Cumberland Mountains and Tennessee River, and Chickamauga Campaign August 16 – September 22.
Operations on Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25 – June 5.
Operations about Marietta and against Kennesaw Mountain June 10 – July 2.
Duty at Green Lake until September 4, and at San Antonio, Texas, until December.