Battle of Piotrków Trybunalski
1939 CE.
Shown on the map at 51.400°, 19.683°.
The Battle of Piotrków Trybunalski was a battle in the German Invasion of Poland from 4 to 6 September 1939, which involved Polish and German tank formations.
Text from the Wikipedia article Battle of Piotrków Trybunalski, licensed CC BY-SA 4.0.