Clearing weather over Western Europe last week was the signal for renewed reconnaissance flights from both sides of the Maginot-Siegfried stalemate. Allied soldiers restudied their pattern charts to be sure they remembered which planes to shoot at. But still both the Allies and Germany stayed their hands from grand-scale air warfare, for the same reasons that have ruled for 21 weeks: economy of men and planes, fear of reprisal, unpreparedness, weather. But a piece of air news came from London, about a German device:
Only two comparatively intact German warplanes had been brought down on British soil. All others damaged either...