The Battle of Legnica, also known as the Battle of Liegnitz or Battle of Wahlstatt, was a battle between the Mongol Empire and the combined defending forces of European fighters that took place at Legnickie Pole near the city of Legnica in the Duchy of Silesia on 9 April 1241.
A combined force of Poles and Moravians under the command of the duke Henry II the Pious of Silesia, supported by feudal nobility and a few knights from military orders sent by the Pope, attempted to halt the Mongol invasion of Europe. The battle came two days before the Mongol victory over the Hungarians at the much larger Battle of Mohi.
Wikipedia https://en.wikipedia.org/wiki/Battle_of_Legnica
Address 59-241, Poland
Coordinates 51°8'53.979" N 16°14'52.198" E