99th Ohio Infantry ​in the American Civil War

Overview

The 99th Ohio Infantry (Three Years’ Service) was an infantry regiment organized at Lima, Ohio, on August 22, 1862, for service in the Union Army during the American Civil War. The regiment served primarily in the Western Theater and was involved in several major campaigns and battles, including Stone’s River, Chickamauga, Chattanooga, the Atlanta Campaign, and Nashville. The unit was consolidated with the 50th Ohio Infantry in early 1865, ceasing to exist as a separate organization.

Organization & Service

The 99th Ohio Infantry (Three Years’ Service) was organized at Lima, Ohio, and mustered into service on August 22, 1862. Initially, the regiment recruited approximately 1,700 men, but 700 were transferred to the 118th Ohio Infantry before departure. The regiment left Camp Lima with 1,021 men, ordered to report at Lexington, Kentucky, but was redirected to Cynthiana. The regiment suffered significant sickness due to hard marches and exposure during the late summer, which reduced its effective strength.

By the time of the Battle of Stone’s River (December 31, 1862 – January 2, 1863), the 99th Ohio could muster only 369 men for duty. The regiment participated in both days of the Battle of Chickamauga (September 19–20, 1863), and was engaged at Lookout Valley, Missionary Ridge, and the “battle above the clouds” during the Chattanooga Campaign in November 1863. After wintering at Shellmound, Tennessee, the regiment moved to Cleveland, Tennessee, in February 1864 and began the Atlanta Campaign in May 1864. The 99th Ohio was engaged at Rocky Face Ridge, Pine Mountain, Kennesaw Mountain, Atlanta, Jonesboro, and Lovejoy’s Station, often under fire and suffering heavy casualties, particularly near Kennesaw Mountain on June 20, 1864.

Following the Atlanta Campaign, the regiment participated in the pursuit of Confederate General Hood into Tennessee and fought at the Battle of Nashville in December 1864. The 99th Ohio pursued the retreating Confederate forces as far as Columbia, Tennessee. In early 1865, the regiment was consolidated with the 50th Ohio Infantry, and the 99th ceased to exist as a separate organization.

Engagements & Campaigns

• Battle of Stone’s River
• Battle of Chickamauga
• Lookout Valley
• Battle above the Clouds (Chattanooga Campaign)
• Missionary Ridge
• Shellmound (winter quarters)
• Rocky Face Ridge (Atlanta Campaign)
• Pine Mountain
• Kennesaw Mountain
• Atlanta
• Jonesboro
• Lovejoy’s Station
• Pursuit of Hood into Tennessee
• Battle of Nashville
• Pursuit to Columbia, Tennessee

Casualties

• Battle of Stone’s River: 20 killed, 43 wounded, 30 captured
• Battle of Chickamauga: 5 killed, 28 wounded, 24 missing
• Lookout Valley and Missionary Ridge: 4 killed, 12 wounded
• Near Kennesaw Mountain (June 20, 1864): 8 killed, 17 wounded
• Atlanta Campaign (total): 30 killed, 56 wounded
• Battle of Nashville: 9 killed and wounded

Some details are incomplete in surviving primary sources.

Field Officers & Commanders

• Colonel Albert Longworthy
• Colonel Peter T. Swaine
• Lieutenant Colonel John E. Cummins
• Major James H. Day
• Major Benjamin F. Le Fever

Regimental Roster

The full roster of the 99th Ohio Infantry (Three Years’ 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 in the regiment.

To view the complete roster, visit the 99th 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, Vol. 2 (Federal Publishing Company, 1908)