The 1st Battalion 11th Marines is comprised of: Headquarters Battery, Alpha Battery, Bravo Battery, Charlie Battery and India Battery.
1st Battalion 11th Marines is a 155MM Howitzer Battalion comprised of four Firing Batteries and a Headquarters Battery. The Primary Mission is the Direct Support of the 1st Marine Division in time of conflict. That support may come in the traditional fashion of artillery support to maneuver forces, or by providing batteries to serve as provisional rifle companies.
It also has the secondary mission of being the primary providers of civil-military operations (CMO). CMO is defined as the activities of the commander that establish, maintain, influence, or exploit relations between military organizations, Government and civilian organizations and the civilian population.
The 1st Battalion 11th Marines was activated on 3 December 1923 at the Marine Corps Base Quantico, Virginia, as the 1st Battalion, 10th Regiment. It participated in mail guard duty in the mid-western United States from October 1926 to February 1927. The battalion deployed during April to June 1927 to Tientsin, China, and was assigned to the 3rd Marine Brigade. The unit returned during September 1928 to MCB Quantico and was detached from the 3rd Marine Brigade during December 1928. It were re-designated on 10 July 1930 to the 1st Battalion, 10th Marines.
The battalion was assigned to the 1st Marine Brigade during September 1935. It was re-designated on 1 September 1940 as the 1st Battalion, 11th Marines. During October 1940, it was deployed to Guantanamo Bay in Cuba. On 1 February 1941, the 1st Marine Brigade was re-designated as the 1st Marine Division. The battalion relocated to New River, North Carolina during April 1941.
In March 1942, 1/11 was deployed to Western Samoa, where participated in the Guadalcanal and New Britain campaigns. The unit also carried out operations on Finschhafen, Peleliu and Okinawa.
After the war the battalion was redeployed in September 1945 to Tientsin, China. It participated in the occupation of North China from September 1945 to January 1947. It was then redeployed during January 1947 to Guam, and detached from the 1st Marine Division. While in Guam, the unit constructed Camp Witek, the 1st Marine Brigade base. The battalion was reassigned during June 1947 to the 1st Marine Brigade. It was deactivated on 1 October 1947.
The battalion was reactivated on 1 October 1949 at Camp Pendleton and assigned to the 1st Marine Division. It was then reassigned during July 1950 to the 1st Provisional Marine Brigade. The battalion was then deployed in July and August 1950 to Pusan, Korea. The battalion participated in the Korean War, from August 1950 to July 1953, taking part in the actions at the Battle of the Pusan Perimeter, at Inchon and the Chosin Resovoir. 1st Battalion, 11th Marines participated in the occupation of the Korean Demilitarized Zone from August 1953 to March 1955. It returned to Camp Pendleton in April 1955.
During the Vietnam War, the battalion operated from Chu Lai, Da Nang, Quang Tri, Phu Bai, Con Thien, Ca Lu, Khe Sanh, Cua Viet, Dong Ha and Quang Nam from January 1966 to March 1971.
From September 1990 to March 1991, 1st Battalion 11th Marines participated in Operation Desert Storm.
In January 2003 the battalion deployed in support of Operation Iraqi Freedom. After participating in the invasion of Iraq it returned to Camp Pendleton in July 2003. Individual firing Batteries have continued to support the MEU cycle in the war on terror since 2003. The Battalion HQ deployed to Anbar Province Iraq with Battery A, Battery C, and Battery K as a provisional infantry Battalion in June 2007. The unit returned to Camp Pendleton in late April 2008.
In May 2010 the Battalion deployed to Helmand Province, in Afghanistan in support of Operation Enduring Freedom, attached to the 1st Marine Division (Forward) Task Force Leatherneck, and reinforced, comprising three gun batteries (Bravo, India 3/12, and Lima 3/12) and a HiMARS rocket Battery (Tango 5/11, later Sierra 5/11). 1/11 was assigned an artillery tactical mission of General Support to Task Force Leatherneck.
The Battalion returned from Afghanistan in November 2011 and began fielding the Expeditionary Fire Support System (EFSS).