[1][2][3] The 38th Ohio Infantry Regiment was organized in Defiance, Ohio and mustered in for three years service on September 1, 1861, under the command of Colonel Edwin D.
[4][5] The regiment was attached to 1st Brigade, Army of the Ohio, October–November 1861.
1st Brigade, 1st Division, Army of the Ohio, to September 1862.
1st Brigade, 1st Division, III Corps, Army of the Ohio, to November 1862.
1st Brigade, 3rd Division (Center), XIV Corps, Army of the Cumberland, to January 1863.
1st Brigade, 3rd Division, XIV Corps, to October 1863.
3rd Brigade, 3rd Division, XIV Corps, to July 1865.
The 38th Ohio Infantry mustered out of service at Louisville, Kentucky, on July 12, 1865.
March to relief of Wild Cat October 19–21.
March to Louisville, Ky., in pursuit of Bragg August 21-September 26.
March to Nashville, Tenn., October 16-November 7, and duty there until December 26.
Battle of Stones River December 30–31, 1862 and January 1–3, 1863.
Passage of the Cumberland Mountains and Tennessee River and Chickamauga Campaign August 16-September 22.
Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5.