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British anti-invasion preparations of World War II entailed a large scale programme of military and civilian mobilisation 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 one and a half 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, known to English speakers as Operation Sealion, was never taken beyond the preliminary assembly of forces stage. Today, very little remains of Britain's anti-invasion preparations. Only reinforced concrete structures such as pillboxes are common and even these have, until very recently, been unappreciated as historical monuments.