Battle of Mokra
1939 CE.
Shown on the map at 50.967°, 18.917°.
The Battle of Mokra took place on 1 September 1939 near the village of Mokra, 5 km north of Kłobuck and 23 km north-west of Częstochowa, Poland. It was one of the first battles of the Invasion of Poland, during the Second World War, and was one of the few Polish victories of that campaign and the first German defeat of the conflict.
Text from the Wikipedia article Battle of Mokra, licensed CC BY-SA 4.0.