| United States|
| August 23, 1862 (1862-08-23) – August 9, 1865 (1865-08-09)|
American Civil War
Battle of Port Gibson
Battle of Champion Hill
Battle of Big Black River
Siege of Vicksburg
Siege of Jackson
The 99th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.
99th Illinois Volunteer Infantry Regiment Wikipedia
The 99th Illinois Infantry was organized at Florence, Illinois and mustered into Federal service on August 23, 1862.
The regiment was mustered out on July 31, 1865 and discharged at Springfield, Illinois on August 9, 1865.
The regiment suffered 4 officers and 47 enlisted men who were killed in action or who died of their wounds 1 officer and 120 enlisted men who died of disease, for a total of 172 fatalities.Colonel George W.K. Bailey - Mustered out December 16, 1864.