42nd Illinois Volunteer Infantry Regiment

42nd Regiment Illinois Volunteer Infantry "First Douglas Regt"
Illinois state flag
Active	July 22, 1861, to December 16, 1865
Country	United States
Allegiance	Union
Branch	Infantry
Engagements	Battle of Chickamauga Battle of Resaca Siege of Atlanta Battle of Franklin Battle of Nashville

The 42nd Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 42nd Illinois Infantry was organized at Chicago, Illinois and mustered into Federal service on July 22, 1861.

The regiment was mustered out on December 16, 1865.

The regiment suffered 13 officers and 168 enlisted men who were killed in action or mortally wounded and 5 officers and 201 enlisted men who died of disease, for a total of 387 fatalities.