The regiment was attached to 1st Brigade, 2nd Division, Army of Kentucky, Department of the Ohio, to December 1862.
1st Brigade, 10th Division, XIII Corps), Department of the Tennessee, December 1862.
1st Brigade, 10th Division, XIII Corps, Army of the Tennessee, to August 1863.
1st Brigade, 4th Division, XIII Corps, Army of the Tennessee, August 1863, and Department of the Gulf to January 1864.
2nd Brigade, 3rd Division, XIII Corps, Army of the Gulf, to March 1864.
3rd Brigade, 3rd Division, XIX Corps, Department of the Gulf, to December 1864.
3rd Brigade, Reserve Corps, Military Division West Mississippi, to February 1865.
The 83rd Ohio Infantry mustered out of service at Galveston, Texas, on July 24, 1865, and was discharged at Camp Dennison on August 10, 1865.
Moved to Covington, Ky., September 3, 1862, to repel Kirby Smith's threatened attack on Cincinnati, Ohio.
Expedition from Milliken's Bend to Dallas Station and Delhi, December 25–26.
Assault and capture of Fort Hindman, Arkansas Post, January 10–11.
Bayou de Paul and battle of Sabine Cross Roads April 8, 1864.
Moved to Kennersville, La., January 28, then to New Orleans and to Barrancas, Fla. Campaign against Mobile, Ala., and its defenses March–April.
Moved to Mobile May 12, then to Galveston, Texas, June 13, and duty there until July 24.