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Germany wasn't able to do much aerial reconnaissance by that point in the war so they wouldn't have seen the tanks. The fake signals traffic was probably more i

• Aloha 7y ago
  They were flying aerial recon missions up to the point they lost the forward airfields in France.
  • caseysoftware 7y ago
    And like most retreating forces, they likely had leave-behinds and friendly locals reporting in. Since locals wouldn't be able to get close, "it sounded like a bunch of tanks!" and "it looked like some tanks!" would have worked pretty well.
    • rjsw 7y ago
      The tanks were in southern England, there were no "friendly locals" to report anything to Germany.