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|type=Army Group |role= |size=2 Field Armies |command_structure=Allied Expeditionary Force |current_commander= |garrison= |ceremonial_chief= |colonel_of_the_regiment= |nickname= |patron= |motto= |colors= |march= |mascot= |battles= |notable_commanders= Bernard Paget Bernard Montgomery |anniversaries= }} The 21st Army Group was a World War II British headquarters formation, in command of two field armies and other supporting units, consisting primarily of the British Second Army and the First Canadian Army. Established in London during July 1943, under the command of Supreme Headquarters Allied Expeditionary Force (SHAEF), it was assigned to Operation Overlord, the Western Allied invasion of Europe, and was an important Allied force in the European Theatre. 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 May 1945, after which it was redesignated the British Army of the Rhine (BAOR). ==Normandy== Commanded by General (later Field Marshal) Sir Bernard Montgomery, 21st Army Group initially controlled all ground forces in Operation Overlord (the United States First Army and British Second Army). When sufficient American forces had landed, their own 12th Army Group was activated, under General Omar Bradley, and the 21st Army Group was left with the British Second Army and the newly activated First Canadian Army which, despite its title, contained many British and Polish troops. Normandy was a battle of attrition for the British and Canadian troops, drawing in most of the available German reinforcements, especially armoured divisions, around Caen at the eastern end of the lodgement. The Germans lacked the ability to prevent the American breakout at the western end of the Normandy beachhead in early August 1944. Following the German attack towards Mortain, the American breakout and an advance by the 21st Army Group the German armed forces in Normandy were nearly enveloped in the Falaise pocket, and subsequently routed retreating towards the Low Countries. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「21st Army Group」の詳細全文を読む スポンサード リンク
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