[Caluabdum]

European plate mail was the reason for the invention of the warhammer because swords were mostly ineffective.

May be so but I also have my reasons to believe there were techniques developed against those armors and as some said before, the range of weapons used is so large, we can't really say they only used this a
or that...

You really should learn more about a subject in order to argue intelligently about it.

I only discuss with the knowledge I have from reading texts and watching documentary's if what I say , is incorrect, blame the source ^^