There was old business between Teutonic knights with Great Master Urlich von Jungingen leadership and Poland - Lithuania military union with Vytautas The Great (Lithuania) and Jagiello (Poland) leadership. Biggest battle between Teutonic knights and Lithunia - Poland union was in 1410 when their armies stopped near town of Grunwald (Green Forest). Sun was shining to knights heavy armor and troubling time of battle's waiting. Teutonic knights wasn't able to start battle, because their eniemies main forces was hiding in the forest. After some hours of praying lithunians attacked from the right flank, the poles from the left. The enviroment and troop's number are historic definite (Teutonic order has 51, Poland 50 and Lithuania 41 (you must select easy difficulty level fot this)). The stones marks towns.