Battle of Grunwald, it was the battle which killed Grand Master von Jungingen. The guy at the the back, under the Teutonic shield is Witold, a Lithuanian prince. Guy in Teutonic robes is (obviously) the Grand Master.
Hussars, f*cking badass. I saw a bunch of sets of their armour at the Polish National Military Museum.
Not sure where this is, but I'm thinking it's at the Battle of Vienna.
HUSSAR OUT OF F*CKING NOWHERE, saw the original painting at the Polish National Military Museum.