Battery I, 2nd Illinois Light Artillery Regiment was an artillery battery that served in the Union Army during the American Civil War.
The battery was organized at Camp Butler near Springfield, Illinois and mustered in for a three-year enlistment on December 31, 1861 under the command of Captain Charles W. Keith.
The battery was attached to District of Cairo to February 1862.
Flotilla Brigade, Army of the Mississippi, to April 1862.
Artillery, 11th Division, III Corps, Army of the Ohio, to November 1862.
Artillery, 4th Division, Center, XIV Corps, Army of the Cumberland, to January 1863.
Artillery, 2nd Division, Reserve Corps, Department of the Cumberland, to October 1863.
Artillery, 1st Division, XI Corps, Army of the Cumberland, to April 1864.
Artillery Brigade, XIV Corps, to June 1865.
Battery I, 2nd Illinois Light Artillery Regiment mustered out of service on June 14, 1865.
Moved to Iuka, Mississippi, then to Courtland, Alabama, and duty along Memphis & Charleston Railroad until September.
Passage of Cumberland Mountains and Tennessee River, and Chickamauga Campaign August 16-September 22.
Operations on Pumpkin Vine Creek and battles about Dallas, New Hope Church, and Allatoona Hills May 25-June 5.
Operations about Marietta and against Kennesaw Mountain June 10-July 2.
March to Washington, D.C., via Richmond, Virginia, April 29-May 20.