As part of the nation's mobilization, 2-320th was constituted, organized and activated in August 1917 as Battery B, 320th Field Artillery (B/320th FA).

As part of the original 82nd Division, B/320th FA played a key role at Lorraine, St. Mihiel, and the Meuse Argonne region in France.

The 320th GFAB next fought in Operation Market Garden and then the Battle of the Bulge when the Germans attempted their last-ditch offensive.

On 1 August 1951 it was reorganized and redesignated as the 320th Airborne Field Artillery Battalion (AFAB), and activated at Fort Benning, Georgia.

As a member of the famed 101st Airborne Division, the battalion deployed 3 times to Iraq in support of the operation, to include the initial push into the country 24 March 2003.

Note: The published Army lineage, dated 30 June 2010, shows only Iraqi Governance in the War on Terrorism.