The headquarters of the 11th Infantry Brigade was constituted on 16 November 1917 in the Regular Army as part of the 6th Division and organized on 4 December at Camp Forrest.

[3] The Brigade began its overseas service in June 1918 and spent 43 days in combat in France.

The brigade continued to include the 51st and 52d Infantry, also organized as RAI units, and on 15 August 1927 was reassigned to the 9th Division.

[4] Four days after the relief of the brigade headquarters, the 6th was reactivated under the Triangular structure at Fort Lewis.

[1] The brigade HHC was reconstituted on 15 April 1966 in the Regular Army and activated at Schofield Barracks, Hawaii on 1 July of that year.

However, a lack of the necessary personnel and equipment prevented the organization of the field artillery battalion, engineer company, and signal platoon that completed the structure of a separate brigade.

Despite its reduced strength, the 11th began training and ultimately organized the remaining units at Fort Schofield.

In June 1971, then Brigadier General John W. Donaldson, former commander of the Brigade would be accused and later acquitted of killing 6 Vietnamese civilians on two separate incidents in operations between November 1968 and January 1969, months of the My Lai massacre by taking pot shots at civilians.