First constituted 1 July 1916 in the Regular Army as Battery B, 12th Field Artillery. It was later organized 7 June 1917 at Fort Myer, Virginia, as an element of the 2nd Division (later redesignated as the 2nd Infantry Division). From here the unit was reorganized and redesignated 1 October 1940 as Battery B, 12th Field Artillery Battalion (B-12th FAB). On 15 October 1948 the unit was inactivated at Fort Lewis, Washington. On 10 November 1951 Battery B consolidated with Battery B, 503rd Field Artillery Battalion (B-503rd FAB) (active), and consolidated unit designated as Battery B, 12th Field Artillery Battalion (B-12th FAB). The unit inactivated on 20 June 1957 at Fort Lewis, Washington, and relieved from assignment to the 2nd Infantry Division; concurrently, redesignated as Headquarters and Headquarters Battery, 2nd Battalion, 12th Artillery (HHB, 2-12th Artillery). Later it redesignated on 1 May 1960 as Headquarters and Headquarters Battery, 2nd Howitzer Battalion, 12th Artillery, assigned to the 8th Infantry Division, and activated in Germany (organic elements concurrently constituted and activated). The battalion inactivated 1 April 1963 in Germany and relieved from assignment to the 8th Infantry Division. 13 September 1969 the battalion redesignated as the 2nd Battalion, 12th Artillery, and activated in Vietnam. The battalion inactivated 29 August 1971 at Fort Lewis, Washington. Three days later (1 September 1971 ) it redesignated as the 2nd Battalion, 12th Field Artillery. Activated once again on 1 April 1976 at Fort Sill, Oklahoma. The unit inactivated on 15 September 1984 at Fort Sill, Oklahoma. The unit moved overseas and activated on 16 July 1987 in Herzogenaurach, Germany as a LANCE missile Battalion but was later inactivated on 15 April 1992. The battalion once again redesignated on 1 October 2005 as the 2nd Battalion, 12th Field Artillery Regiment. The battalion was assigned on 1 June 2006 to the newly formed 4th Brigade Combat Team,
2nd Infantry Division, and activated at Fort Lewis, Washington.
Campaigns World War I Aisne, Aisne-Marne, St. Mihiel, Meuse-Argonne, Lorraine 1918, Ile de France 1918
World War II Normandy, Northern France, Rhineland, Ardennes-Alsace, Central Europe
Korean War UN Defensive, UN Offensive, CCF Intervention, First UN Counteroffensive, CCF Spring Offensive, UN Summer-Fall Offensive, Second Korean Winter, Korea: Summer-Fall 1952, Third Korean Winter, Korea: Summer 1953
Vietnam Summer-Fall 1969, Winter-Spring 1970, Sanctuary Counteroffensive, Counteroffensive: Phase VII, Consolidation I
Iraq Iraqi Surge, Iraqi Sovereignty, New Dawn
Afghanistan Transition II == 3rd Battalion ==