[1] The 25th Ohio Infantry Regiment was organized at Camp Chase in Columbus, Ohio and mustered in for three years service on June 28, 1861,[2] under the command of Colonel James A.
[1] On March 17, 1862, Company G was permanently detached and redesignated the 12th Ohio Battery.
[3] The regiment was attached to Cheat Mountain, District West Virginia, to November 1861.
[1] Milroy's Command, Cheat Mountain, District West Virginia, to April 1862.
2nd Brigade, 1st Division, I Corps, Army of Virginia, to September 1862.
[4] 2nd Brigade, 1st Division, XI Corps, Army of the Potomac, to August 1863.
1st Brigade, Coast Division, Department of the South, to February 1865.
[1] The 25th Ohio Infantry mustered out of service on June 18, 1866.
Action at Camp Allegheny, Buffalo Mountain, December 12.
March from Franklin to Strasburg May 26-June 10, pursuing Jackson up the Shenandoah Valley.
Duty at Folly and Morris Islands, S.C., operating against Fort Sumter and Charleston until January 1864.
Denkins' Mills and Beach Creek near Statesburg April 19.
Pleasant April 28, then moved to Charleston May 6 and to Columbia May 7, and garrison duty there until May 25.
Duty in Fairfield, Newberry, Edgefield, Lexington and Richland Counties until April 1866.
Ordered to Tod's Barracks, Ohio, June 6.