Portal:World War II/Featured article/11
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British anti-invasion preparations of World War II entailed a large-scale division of military and civilian mobilization in response to the threat of invasion by German armed forces in 1940 and 1941. The army needed to recover from the defeat of the British Expeditionary Force in France, and 1.5 million men were enrolled as part-time soldiers in the Home Guard. The rapid construction of field fortifications transformed much of Britain, especially southern England, into a prepared battlefield. Short of heavy weapons and equipment, the British had to make the best use of whatever was available.The German invasion plan, Operation Sealion, was never taken beyond the preliminary assembly of forces. Today, little remains of Britain's anti-invasion preparations. Only reinforced concrete structures such as pillboxes are common, and until recently, even these have been unappreciated as historical monuments.On 1 September 1939, Germany invaded Poland; two days later, Britain and France declared war on Germany, launching World War II. Within three weeks, the Red Army of the Soviet Union invaded the eastern regions of Poland in fulfillment of the secret Molotov-Ribbentrop Pact with Germany.