>> In World War II, there's a popular rumor that Polish (not French) cavalry forces charged German tanks at Krojanty, but this is itself a myth (the cavalry attack was against infantry, tanks arrived afterwards).

Not just any cavalry- Polish winged hussars:

https://en.wikipedia.org/wiki/Polish_hussars

Obviously, they could totally take a tank single-handedy, but they have now ascended into heaven to party with the Valkyries.

(It is known.)