Semi-related: During WWII the Germans developed a radar receiver which warned submarines that they were being lit up by airborne radar.
All of a sudden subs were being bombed without their detectors going off. A captured British airman was interrogated about this, and he told the Germans that the brits had developed a system which homed in on the radar receivers.
The Germans sent out panic messages to all subs to stop using the receivers.
In reality, a new frequency of radar was being used, but the airman was celebrated for creatively causing a bit of extra panic.
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