Overview
The 139th Ohio Infantry (One Hundred Days’ Service) was an infantry regiment organized in Ohio for Union service during the American Civil War. Mustered in at Camp Chase, Columbus, Ohio, between May 13 and May 21, 1864, the regiment served a short-term enlistment of 100 days. It was primarily composed of men from the 9th Regiment, Ohio National Guard (Cincinnati), with additional companies from the 82nd Battalion (Van Wert County) and the 71st Battalion (Ottawa County). The regiment served in the Eastern Theater, performing guard duty in Maryland and Washington, D.C.
Organization & Service
The 139th Ohio Infantry (One Hundred Days’ Service) was organized at Camp Chase, Ohio, from May 13 to May 21, 1864. The regiment consisted of nine companies, mainly drawn from the Ohio National Guard. Shortly after organization, the unit traveled via the Central Ohio and Baltimore & Ohio railroads to Washington, D.C., where it was stationed in barracks.
On June 1, 1864, the regiment was assigned to duty at Point Lookout, Maryland. Its primary responsibility was guarding Confederate prisoners of war at the large prison camp located there. The 139th remained at Point Lookout until August 22, 1864, when it was ordered to Baltimore, Maryland. From Baltimore, the regiment returned to Camp Chase, Ohio, and was mustered out of service on August 26, 1864, upon the expiration of its 100-day term.
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
- Guard duty at Washington, D.C. (May 1864)
- Guard duty at Point Lookout, Maryland (June–August 1864)
Casualties
Specific casualty figures for the 139th Ohio Infantry (One Hundred Days’ Service) are not detailed in primary sources. The regiment primarily performed guard duty and did not participate in major combat operations during its term of service.
Field Officers & Commanders
- Lieutenant Colonel Jacob L. Wayne
- Major Alonzo W. Baker
Regimental Roster
The full roster of the 139th Ohio Infantry (One Hundred Days’ Service), including officers and enlisted men, is available on the regiment’s roster page. This resource provides names, ranks, and additional service details valuable for genealogical and historical research.
To view the complete roster, visit the 139th Ohio Infantry (One Hundred Days’ Service) Roster page.
Sources & References
- Official Records of the Union and Confederate Armies, Series I, Vol. 37
- Ohio Roster Commission, Official Roster of the Soldiers of the State of Ohio in the War of the Rebellion, Vol. 8
- Dyer, Frederick H., A Compendium of the War of the Rebellion
- The Union Army, Vol. 2 (Federal Publishing Company, 1908)