The 50th Regiment Illinois Volunteer Infantry, nicknamed the "Blind Half-Hundred," was an infantry regiment that served in the Union Army and fight with the Army of the Tennessee during the American Civil War.

They engaged in such battles as Fort Donelson, Shiloh, Corinth, Vicksburg, the Atlanta Campaign, Allatoona, and the Marches to the Sea and north through the Carolinas.

The "Blind Half Hundred" organized in Quincy, Illinois, and mustered on September 12, 1861.

Companies A-K were from Adams, Brown, Hancock, Warren, and Fulton Counties.

3rd Brigade, 2nd Division, District of Corinth, Miss., 13th Army Corps (Old), Department of the Tennessee, to December, 1862.

3rd Brigade, District of Corinth, 17th Army Corps, to January, 1863.

3rd Brigade, District of Corinth, 16th Army Corps, to March, 1863.

3rd Brigade, 2nd Division, 16th Army Corps, to September, 1864.

Grant's Central Mississippi Campaign November, 1862, to January, 1863.

Expedition against Forest in West Tennessee December 18, 1862 – January 3, 1863.

Great Bear Creek and Cherokee Station April 17.

Moved to Eastport, Pulaski and Lynnville November 6–12, and duty there until March, 1864.

[1] The regiment suffered 2 officers and 60 enlisted men who were killed in action or mortally wounded and 129 enlisted men who died of disease, for a total of 191 fatalities.