Lesser-known details of the France 1940 Campaign

Your friendly history lesson, with a little bit of Op-Ed thrown in, some parts of the 1940 campaign in France of which many folks weren't aware.
Why was Guderian relieved of command?
Why might condoms have changed the course of the war?
What's a Niwi?
Was the French failure one of doctrine, or execution?
You get the idea.

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