Nemmersdorf massacre
1944 CE.
Shown on the map at 54.520°, 22.066°.
The Nemmersdorf massacre was a civilian massacre perpetrated by Red Army soldiers in the late stages of World War II. Nemmersdorf (present-day Mayakovskoye, Kaliningrad Oblast) was one of the first prewar ethnic German settlements to fall to the advancing Red Army during the war. On 21 October 1944, Soviet soldiers killed many German civilians as well as French and Belgian POWs.
Text from the Wikipedia article Nemmersdorf massacre, licensed CC BY-SA 4.0.