Civil War Wiki
12th Regiment Illinois Volunteer Infantry (3 Year)
Illinois flag
Active August 1, 1861 to July 18, 1865
Country United States
Allegiance Union
Branch Infantry
Engagements Battle of Shiloh
Battle of Corinth
Battle of Resaca
Battle of Atlanta
Battle of Jonesboro
March to the Sea
Battle of Bentonville

The 12th Regiment Illinois Volunteer Infantry, knwn as the "1st Scotch Regiment," was an infantry regiment that served in the Union Army during the American Civil War.


The 12th Illinois Infantry was mustered into Federal service for a three year enlistment on August 1, 1861 at Cairo, Illinois.

The regiment was mustered out on July 18, 1865 at Camp Butler, Illinois..

Total strength and casualties[]

The regiment suffered 5 officers and 143 enlisted men killed in action or mortally wounded and 3 officers and 109 enlisted men who died of disease, for a total of 260 fatalities.[1]


  • Colonel John McArthur - promoted to brigadier general on May 1, 1862.
  • Colonel Augustus L. Chetlain - promoted to brigadier general on December 19, 1863.
  • Lieutenant Colonel Henry Van Sellars - mustered out with the regiment.


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 Cvil war website after Illinois Adjutant General's muster rolls