Civil War Wiki
20th Regiment Illinois Volunteer Infantry
Illinois state flag
Active June 13, 1861 to July 16, 1865
Country United States
Allegiance Union
Branch Infantry
Engagements Fort Henry
Battle of Shiloh
Battle of Port Gibson
Battle of Champion Hill
Battle of Big Black River
Siege of Vicksburg
Battle of Kennesaw Mountain
Battle of Atlanta
Battle of Jonesboro
March to the Sea
Battle of Bentonville

The 20th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


The 20th Illinois Infantry was organized at Joliet, Illinois and mustered into Federal service on June 13, 1861 for a three year enlistment.

The regiment was mustered out of service on July 16, 1865.

Total strength and casualties[]

The regiment suffered 7 officers and 132 enlisted men who were killed in action or who died of their wounds and 1 officer and 191 enlisted men who died of disease, for a total of 331 fatalities.[1]


  • Colonel C. Carroll Marsh -resigned on April 22, 1863.
  • Colonel Daniel Bradley - discharged February 13, 1865.
  • Lieutenant Colonel Henry King - mustered out with the regiment.[2]

See also[]

  • List of Illinois Civil War Units
  • Illinois in the American Civil War


  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 Civil War website after Illinois Adjutant General's muster rolls