Civil War Wiki
18th Regiment Illinois Volunteer Infantry
Illinois state flag
Active May 28, 1861 to December 31, 1865
Country United States
Allegiance Union
Branch Infantry
Engagements Fort Henry
Fort Donelson
Battle of Shiloh
Siege of Vicksburg

The 18th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


The 18th Illinois Infantry was organized at Aurora, Illinois and mustered into Federal service on May 28, 1861 for a three year enlistment.

The regiment was mustered out of service on December 31, 1865.

Total strength and casualties[]

The regiment suffered 6 officers and 99 enlisted men who were killed in action or who died of their wounds and 7 officers and 282 enlisted men who died of disease, for a total of 394 fatalities.[1]


  • Colonel Michael K. Lawler - promoted to brigadier general on April 14, 1863.
  • Colonel Daniel H. Brush - resigned August 21, 1863.
  • Lieutenant Colonel Samuel B Marks - resigned 1864[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