Civil War Wiki
99th Regiment Illinois Volunteer Infantry
Illinois flag
Active August 23, 1862 to August 9, 1865
Country United States
Allegiance Union
Branch Infantry
Equipment Battle of Port Gibson
Battle of Champion Hill
Battle of Big Black River
Siege of Vicksburg
Siege of Jackson
Fort Blakely

The 99th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


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.

Total strength and casualties[]

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.[1]


  • Colonel George W.K. Bailey - Mustered out December 16, 1864.[2]

See also[]

  • List of Illinois Civil War Units
  • Illinois in the American Civil War
  • Thomas J. Higgins, a soldier in the 99th Illinois who won the Medal of Honor for his actions during the Battle of Vicksburg.


  1. The Civil War Archive website after Dyer, Frederick Henry. A Compendium of the War of the Rebellion. 3 vols. New York: Thomas Yoseloff, 1959.
  2. Illinois in the Cvil war website after Illinois Adjutant General's muster rolls