Overview
The 147th Ohio Infantry (One Hundred Days’ Service) was an infantry regiment from Ohio organized for short-term service during the American Civil War. Mustered in at Camp Dennison on May 16, 1864, the regiment served in the Union Army, primarily in the defenses of Washington, D.C. The unit was composed of men from the 25th Regiment and 87th Battalion, Ohio National Guard, both from Miami County. The 147th Ohio Infantry was part of the widespread mobilization of Ohio National Guard units for 100 days’ service in 1864.
Organization & Service
The 147th Ohio Infantry (One Hundred Days’ Service) was organized at Camp Dennison, Ohio, on May 16, 1864, with Colonel B. F. Rosson commanding. The regiment was formed from the 25th Regiment and 87th Battalion, Ohio National Guard. On May 20, 1864, the regiment departed for Washington, D.C., where it reported to General Augur and was assigned to duty at Fort Ethan Allen. On May 27, four companies were detached and sent to Fort Marcy. Company A was detailed on June 1 to perform guard duty at division headquarters and remained in that capacity for the duration of its service.
At midnight on June 11, the regiment received orders to move to Fort Reno. The unit marched as far as Fort Stevens and took position in the trenches, supporting the 1st Maine and 1st Ohio Batteries. The regiment remained in this defensive posture until July 4, after which it returned to Fort Ethan Allen. On August 23, 1864, the regiment was ordered to return to Camp Dennison, Ohio, where it was mustered out of service on August 30, 1864.
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
- Duty at Fort Ethan Allen, Washington, D.C. (May–June 1864)
- Detachment to Fort Marcy (May 27, 1864)
- Guard duty at division headquarters (Company A, from June 1, 1864)
- Ordered to Fort Reno and Fort Stevens; support in trenches (June–July 1864)
- Return to Fort Ethan Allen (July 4, 1864)
Casualties
Specific casualty figures for the 147th Ohio Infantry (One Hundred Days’ Service) are not detailed in the primary sources. The regiment primarily performed garrison and defensive duties and did not participate in major battles. Some details are incomplete in surviving primary sources.
Field Officers & Commanders
- Colonel B. F. Rosson
- Lieutenant Colonel John R. Woodward
- Major John B. Shannon
Regimental Roster
The full roster of the 147th Ohio Infantry (One Hundred Days’ Service), including officers and enlisted men, is available for genealogical and historical research. This roster provides names, ranks, and additional service details where available.
To view the complete roster, visit the 147th Ohio Infantry (One Hundred Days’ Service) Roster page.
Sources & References
- Official Records of the Union and Confederate Armies, Series I, Vol. XXXVII
- 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”
- Federal Publishing Company, “The Union Army,” Vol. 2 (1908)