Definitely a great article.

I read a book once about medieval warfare, mostly swordsmanship and a little about bows and arrows and it struck me how interesting it might be to do an RP with a more grounded serious take on these things.

I don't really know enough to run one or participate very well in one, but this is a great guide to help folks ground their writing a little more.  Even just fleshing out battles a little bit to show their characters tendencies.

Maybe a great army with a kinda shit leader who chooses poorly where to position his troops or maybe a great commander putting the right people in the right places to win a battle where they were significantly outnumbered