Historic weaponry, armor and such discussion/In and Out of game

So, first off I want to mention that I wasn’t sure what category to put this thread in, as it does not souly relate to adding ideas and/or changes to the game, but neither is it just focused are general historic weaponry discussion.
Second, I thought of this thread due to a conversation Here
talking about duel wielding, spears and shields, attacking in closed environments, etc.
Third, I thought it’d make some sense to expand upon the idea of history, with discussing things like armor and buildings.
And lastly, know that there is apparently lots of confusion about various things in history. As such, if you can manage, please provide at least one link as a sort of verification.
It’s not needed, of course. But I’m sure we all know by now how accurate information can be a mess on the internet.