[1][2][3] The regiment was attached to Cheat Mountain, District Western Virginia, to March 1862.
2nd Brigade, 1st Division, XI Corps, Army of the Potomac, to October 1862.
3rd Brigade, 3rd Division, XX Corps, Army of the Cumberland, to July 1865.
The 73rd Ohio Infantry mustered out of service at Louisville, Kentucky, on July 20, 1865.
The 73rd OVI's detailed service is as follows (NOTE — Battles are Bolded, Italicized; campaigns are Italicized): The regiment lost a total of 321 men during service; 4 officers and 167 enlisted men killed or mortally wounded, 1 officer and 149 enlisted men died of disease.