In 1940, less than a year after blitzkrieging its way through Poland and the rest of Western Europe, the Nazi army set its sights on the UK and commenced a vicious bombing campaign targeting the nation's major cities. Luckily, the British Royal Air Force saw this threat coming and cleverly deployed a series of radio stations to counter the Luftwaffe's legions in what would become one of the world's first practical radar early warning systems.
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