Battle of Marienburg
1422 CE.
Shown on the map at 54.040°, 19.028°.
The Battle of Marienburg occurred during the Golub War, near Marienburg Castle (Malbork Castle), between the Moldavian cavalry of Alexander I and the Teutonic Knights of Paul von Rusdorf supported by the German mercenaries. It took place on 27 September 1422, resulting in Moldavian victory.
Text from the Wikipedia article Battle of Marienburg (1422), licensed CC BY-SA 4.0.