Formation patch HQ British Troops in the Low Countries (canvas)

The 21st Army Group was a British headquarters formation, in command of two field armies and other supporting units, consisting primarily of Britishand Canadian forces. Established in London during July 1943, under the command of Supreme Headquarters Allied Expeditionary Force(SHAEF), it was assigned toOperation Overlord, the Western Allied invasion ofEurope, and was an important Allied force in the European Theatre of the Second World War.

The 21st Army Group operated in Northern France, Luxembourg, Belgium, the Netherlands and Germany from June 1944 until the end of the war in Europe in 1945, after which it was redesignated the British Army of the Rhine (BAOR)