The 173rd Ohio Infantry was organized in Gallipolis, Ohio. Most of the men were from Ohio’s 11th Congressional District. They mustered into Union service for a one year term, under the command of Colonel John H Hurd on September 18th 1864. The men were sent to the Defenses of Nashville in the Department of Cumberland, where they were assigned to guard duty. The 173rd was in the town during the Battle of Nashville on December 15-16th 1864, and guarded the prisoners there until February 1865.
The 173rd was mustered out of service at Nashville, Tennessee, discharged on July 5th 1865 at Camp Dennison, Cincinnati, Ohio. The regiment lost 108 men during their service.