The 197th Ohio Infantry Regiment lost 18 enlisted men to disease during the Civil War.
|March 28||Organized at Camp Chase, Ohio, and mustered in under Colonel Benton Halstead|
|April 25||Left State for Washington, D.C. Assigned to a Provisional Brigade, 9th Army Corps. Duty at Washington and Alexandria.|
|May 11||Moved to Dover, Del., and duty at Camp Harrington. Attached to 3rd Separate Brigade, 8th Army Corps, Middle Department.|
|May 31||Moved to Havre de Grace and assigned to duty as guard on line of the Philadelphia, Wilmington & Baltimore Railroad by Detachments|
|July 3||Moved to Baltimore, Md. and duty as guards at camps and hospitals around that city|
|July 31||Mustered out|