They Laughed At His "Impossible" Tube — Then It Killed Every German Bomber Over The Convoys !
Darkest Docs and war docs
I don't know how much trouble German airplanes caused Allied cargo ships, the I suspect the main threat was from the German submarines. However, it would nice to have something if you had a German airplane bearing down on you. I wonder that pilots would even be able to see something as small as a gernade, but evidently the thing did least stave off a few attacks.

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