Overview
The 18th Ohio Infantry (Three Years’ Service) was an infantry regiment from Ohio that served in the Union Army during the American Civil War. Organized at Athens, Ohio, between August 16 and September 28, 1861, the regiment was mustered in for a three-year term. It participated in operations primarily in the Western Theater and was known for its involvement in several significant campaigns and battles. The regiment mustered out on November 9, 1864, at the expiration of its service term, with veterans and recruits consolidated into the 18th Veteran Ohio Infantry.
This unit is distinct from the 18th Ohio Infantry (Three Months’ Service).
Organization & Service
The 18th Ohio Infantry (Three Years’ Service) was organized at Athens, Ohio, from August 16 to September 28, 1861. The regiment, numbering approximately 930 men at organization, moved into Kentucky and participated in the occupation of Bowling Green. It subsequently took part in the occupation of Huntsville, Alabama. At Bridgeport, Alabama, the regiment was attacked by Confederate cavalry under Scott but successfully held its position for three hours. The regiment also engaged in a fight at Limestone Bridge, suffering three killed and several wounded.
On August 29, 1862, Companies A and I of the 18th Ohio, along with Company D of the 9th Michigan, defended a stockade near Manchester, Tennessee, against an attack by Confederate forces under Forrest, repulsing the enemy without Federal loss. The regiment played a notable role at the Battle of Stone’s River, including a charge that checked a Confederate advance and the capture of four pieces of artillery following a successful assault. In June 1863, the regiment participated in the advance on Tullahoma and, on September 11, confronted Bragg’s army at Dug Gap. The 18th Ohio fought at the Battle of Chickamauga, making several charges during the engagement.
After the expiration of its original term, the regiment was mustered out on November 9, 1864. Veterans and recruits were consolidated with those of the 35th Ohio Infantry to form the 18th Veteran Ohio Infantry. The reorganized unit participated in the Battle of Nashville, suffering significant casualties, and subsequently pursued Hood’s forces to Huntsville, Alabama, and assisted in the capture of Decatur. The regiment remained on duty in Augusta, Georgia, until October 9, 1865, when it was ordered to muster out and returned to Columbus, Ohio, for final discharge on October 22, 1865.
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
- Occupation of Bowling Green, Kentucky
- Occupation of Huntsville, Alabama
- Action at Bridgeport, Alabama
- Action at Limestone Bridge
- Defense at Manchester, Tennessee (August 29, 1862)
- Battle of Stone’s River
- Tullahoma Campaign
- Action at Dug Gap (September 11, 1863)
- Battle of Chickamauga
- Battle of Nashville (as part of 18th Veteran Ohio Infantry)
- Pursuit to Huntsville and capture of Decatur, Alabama
Casualties
At Limestone Bridge, the regiment lost 3 killed and several wounded. During the Battle of Nashville, the regiment lost 4 officers out of 7 and 75 men killed and wounded out of less than 200 engaged. Comprehensive casualty figures for the entire service term are not fully detailed in available primary sources.
Field Officers & Commanders
- Colonel Timothy R. Stanley
- Colonel Charles H. Grosvenor
- Lieutenant Colonel Josiah Given
- Lieutenant Colonel John M. Benedict
- Major Johnson M. Welch
- Major Robert Chappell
Regimental Roster
The full roster of the 18th Ohio Infantry (Three Years’ Service), including officers and enlisted men, is available for genealogical and historical research. The roster provides details on enlistment, rank, and service record for each member of the regiment.
To view the complete roster, visit the 18th Ohio Infantry (Three Years’ Service) Roster page.
Sources & References
- Official Records of the Union and Confederate Armies, Series I, various volumes
- 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”
- Fox, William F., “Regimental Losses in the American Civil War”
- “The Union Army,” Federal Publishing Company, 1908, Volume 2