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11th Infantry Brigade (United States)


11th Infantry Brigade (United States)

11th Infantry Brigade
11th Brigade shoulder sleeve insignia
Active 1917–21, 1967–71
Country United States of America
Branch United States Army
Type Infantry
Role Light infantry
Size Brigade
Engagements World War I
Distinctive unit insignia

The 11th Infantry Brigade (Light) was an infantry brigade of the United States Army. It was first formed as part of the United States Army's 6th Division during World War I. It is best known for its service with the 23rd Infantry Division (Americal) in the Vietnam War. It was active from 1967 through 1971. The brigade is known for its responsibility in the My Lai Massacre.


World War 1

Activated: November 1917


  • 51st Infantry Regiment
  • 52nd Infantry Regiment
  • 16th Machine-Gun Battalion
  • 11th Field Artillery Battalion

Overseas: June 1918 Days of combat: 43 Returned to U.S.: June 1919 Deactivated: 30 September 1921 at Camp Grant, Illinois

Brigade Headquarters was inactive through World War II after the US Army reorganized its divisions from two brigades of two regiments (the Square Division), into one of three regiments with no brigades (the Triangular Division) concept.


The brigade was organized as a separate infantry brigade at Schofield Barracks, Hawaii as the first element of the 6th Infantry Division. The 6th Infantry Division was scheduled to be activated for deployment to Vietnam but Secretary of Defense McNamara cancelled its activation. The 11th Infantry Brigade was deployed, and during the Vietnam War served in the United States Army's 23rd Infantry Division (called the Americal Division). Elements of the brigade were responsible for the My Lai massacre where members of the brigade's 1st Battalion, 20th Infantry Regiment murdered between 340 and 500 civilians in 1968. Many of its former servicemen were interviewed in the documentary Four Hours in My Lai.

Order of battle:


  • Summers, Harry G. Historical Atlas of the Vietnam War. New York: Houghton Mifflin Company.
  • Stanton, Shelby L. Vietnam Order of Battle, A Complete Illustrated Reference to U.S. Army Combat and Support Forces in Vietnam 1961-1973. Stackpole Books, 1981.
  • "The Brigade: A History, Its Organization and Employment in the US Army"

External links

  • 11th Light infantry Brigade website
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