Overview
The 13th Ohio Infantry (Three Months’ Service) was an infantry regiment organized in Ohio for Federal service at the outset of the American Civil War. The regiment was mustered into United States service at Camp Jackson, Columbus, Ohio, between April 24 and May 4, 1861, for a term of three months. It served on the Union side, primarily in the Western Theater, during the early mobilization period following the outbreak of hostilities.
This unit is distinct from the 13th Ohio Infantry (Three Years’ Service).
Organization & Service
The companies of the 13th Ohio Infantry (Three Months’ Service) were enrolled between April 20 and April 27, 1861, in response to President Lincoln’s initial call for volunteers. The regiment was officially mustered into Federal service at Camp Jackson, Columbus, Ohio, from April 24 to May 4, 1861. Colonel A. Saunders Piatt commanded the regiment, with Lieutenant Colonel Columbus B. Mason and Major Joseph S. Hawkins as principal field officers.
During its three months of service, the regiment was primarily engaged in garrison and guard duties within Ohio and along the border regions, as the state organized its defenses and prepared for further mobilization. The regiment did not participate in major field campaigns or battles during this term. In June 1861, the regiment began reorganizing for three years’ service. Those members who did not reenlist for the longer term were mustered out with their companies at Columbus, Ohio, between August 14 and August 25, 1861.
Research This Regiment Further
If you’d like to explore this unit’s history in more depth, regimental histories and Civil War reference works offer valuable detail.
Engagements & Campaigns
- Garrison and guard duty in Ohio and border regions (April–August 1861)
Casualties
Specific casualty figures for the 13th Ohio Infantry (Three Months’ Service) are not detailed in primary sources. The regiment did not participate in major battles during this term, and losses were minimal.
Field Officers & Commanders
- Colonel A. Saunders Piatt
- Lieutenant Colonel Columbus B. Mason
- Major Joseph S. Hawkins
Regimental Roster
The full roster of the 13th Ohio Infantry (Three Months’ Service), including officers and enlisted men, is available for genealogical and historical research. The roster provides names, ranks, and service details for those who served during the regiment’s three months’ term.
To view the complete roster, visit the 13th Ohio Infantry (Three Months’ Service) Roster page.
Sources & References
- Official Records of the Union and Confederate Armies, Series I, Vol. 2
- Ohio Roster Commission, “Official Roster of the Soldiers of the State of Ohio in the War of the Rebellion”
- Dyer, Frederick H., “A Compendium of the War of the Rebellion”
- “The Union Army,” Federal Publishing Company, 1908, Vol. 2