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9th Regiment Illinois Volunteer Infantry (3 Years)
Illinois state flag
Active July 26, 1861 to March 15, 1863
Country United States
Allegiance Union
Branch Infantry
Engagements None

The 9th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


The 9th Illinois Infantry was organized at Cairo, Illinois and mustered into Federal service between July 26 and August 31, 1861 for a three year enlistment.

The regiment was converted to the 9th Illinois Volunteer Mounted Infantry Regiment on March 15, 1863.

Total strength and casualties[]

The regiment suffered 5 officers and 211 enlisted men killed in action or mortally wounded and 1 officer and 200 enlisted men who died of disease, for a total of 417 fatalities.[1]


  • Colonel Augustus Mersy - 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