Battery A, 2nd Illinois Light Artillery Regiment, was an artillery battery that served in the Union Army during the American Civil War. The battery was alternately known as Davidson's Battery, Borris' Battery, and Peoria Light Artillery. Service Battery A was organized Peoria, Illinois and mustered in May 23, 1861 for state service under the command of Captain Peter Davidson. The battery was subsequently mustered into federal service for a three years service on August 17, 1861 at Jefferson Barracks in St. Louis, Missouri. The battery was attached to Fremont's Army of the West and to Department of the Missouri to February 1862. 2nd Brigade, 3rd Division, Army of Southwest Missouri, to May 1862. Artillery, 3rd Division, Army of Southwest Missouri, to July 1862. District of Eastern Arkansas, Department of the Missouri, to December 1862, and Department of the Tennessee to January 1863. Artillery, 12th Division, XIII Corps, Army of the Tennessee, to May 1863. Artillery, 14th Division, XIII Corps, Army of the Tennessee, to July 1863. 3rd Brigade, 1st Division, XIII Corps, Department of the Tennessee, to August 1863, and Department of the Gulf to September 1863. Artillery, 1st Division, XIII Corps, Department of the Gulf, to June 1864. Defenses of New Orleans, Louisiana, Department of the Gulf, to April 1865. District of LaFourche, Department of the Gulf, to July 1865. Battery A, 2nd Illinois Light Artillery mustered out of service July 28, 1865. Detailed service Moved to Alton, Illinois, July 6, then to St. Charles and Mexico, Missouri, and duty in northern Missouri until August. Ordered to Jefferson Barracks, Missouri. Moved to Jefferson City, Missouri, then to Boonville, Missouri, October 1. Fremont's Campaign against Springfield, Missouri, October 21 – November 8, 1861. At Ottersville, Missouri, until January 1862. Moved to Lebanon, Missouri, January 25. Curtis' advance on Springfield, Missouri, January 25 – February 11. Pursuit of Price into Arkansas February 14–29. Battle of Pea Ridge, March 6–8. March to Sugar Creek March 10, then to Cross Timbers March 15, and over Ozark Mountains to Batesville April 5 – May 3. March to Helena, Arkansas, May 25 – July 13. Duty at Helena until March 1863. Ordered to Milliken's Bend, Louisiana, March 20, and duty there until April. Movement on Bruinsburg and turning Grand Gulf April 25–30. Battle of Thompson's Hill, Port Gibson, Mississippi, May 1. Battle of Champion Hill May 16. Big Black River May 17. Siege of Vicksburg,