The 155th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.
The 155th Illinois Infantry was organized at Camp Butler, Illinois, and mustered into Federal service on February 28, 1865, for a one-year enlistment.
On March 2nd, The 904-Strong Regiment moved to Tullahoma, Tennessee, and was assigned to the command of Brevet Brigadier General Dudley. On June 17th, The Regiment was Divided Into Detachments of 20 or 30 men each, assigned to Guard duty on the Nashville and Chattanooga Railroad, occupying the blockhouse from Nashville to Duck River, A Distance of 50 Miles.
On September 4th, the Regiment Was Mustered out of service, moving to Camp Butler, Illinois, Receiving Its Final Pay and Discharge
The regiment mustered out September 4, 1865.
The regiment suffered 71 enlisted men who died of disease for a total of 71 fatalities.