Boryszew massacre
1939 CE.
Shown on the map at 52.214°, 20.226°.
The Boryszew massacre, which took place on September 22, 1939, in the village of Boryszew (now a district of Sochaczew), was a war crime committed by the Wehrmacht during its invasion of Poland. On that day, 50 Polish prisoners of war from the "Bydgoszcz" Battalion of National Defense were executed following a kangaroo court trial. The massacre was carried out in retaliation for the battalion’s participation in the events of the so-called "Bloody Sunday" in Bydgoszcz.
Text from the Wikipedia article Boryszew massacre, licensed CC BY-SA 4.0.