The 155th Ohio Infantry Regiment lost 1 officer and 22 enlisted men who died of disease during the Civil War.
|May||Organized at Camp Dennison, Ohio. The regiment was made up of the 34th Regiment Ohio National Guard from Preble County and the 80th and 81st Battalions Ohio National Guard from Mercer and Auglaize Counties.|
|May 15||Mustered in for 100 days service under the command of Colonel Caleb Marker, Lieutenant Colonel William Sayler, and Major Alben L. Whiteman.
Company A – Captain James R. H. Bernard
|May 20-July 18||Companies A-F & H moved to Cincinatti.
Companies G, I & K served at Camp Dennison.
|July||Companies G, I & K moved to Falmouth, Kentucky and then Covington, Kentucky in respose to Confederate General John Hunt Morgan’s operations.|
|July 28||The regiment reunited at Covington and moved to Paris, Kentucky. It then moved to Cincinatti and Parkersburg, then travelled by rail to Cumberland, Maryland in response to Confederate General Jubal Early’s Raid on Washington.|
|July 31||Arrived at Cumberland, Maryland and was assigned to Kelly’s Reserve Division, Department of West Virginia.|
|August 1||Action near Folck’s Mills, Cumberland, with Bradley Johnson’s Confederate forces.|
|August 26||Ordered home for muster out.|
|September 1||Mustered out at Camp Dennison.|