Battle of Mława
1939 CE.
Shown on the map at 53.117°, 20.367°.
The Battle of Mława, otherwise known as the Defence of the Mława position, took place to the north of the town of Mława in northern Poland between 1 and 3 September 1939. It was one of the opening battles of the Invasion of Poland and World War II in general. It was fought between the forces of the Polish Modlin Army under General Krukowicz-Przedrzymirski and the German 3rd Army under General Georg von Küchler.
Text from the Wikipedia article Battle of Mława, licensed CC BY-SA 4.0.