Various deceptions also played out, including the deployment of three dozen balloons with radar reflectors to simulate invasion ships where none sailed. Near Calais, where a German radar site had deliberately been left functioning, Allied planes dumped metal confetti, known as Window, into the airstream to mimic the electronic signature of bomber formations sweeping toward northern France. West of Le Havre and Boulogne, planes flying meticulously calibrated oblong courses also scattered enough Window to simulate two large naval fleets, each covering two hundred square miles, steaming toward
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