Kaunas massacre of October 29, 1941
1941 CE.
Shown on the map at 54.945°, 23.871°.
The Kaunas massacre of October 29, 1941, also known as the Great Action, was the largest mass murder of Lithuanian Jews. 9,200 people among them 2,007 Jewish men, 2,920 women, and 4,273 children were murdered in a single day at the Ninth Fort.
Text from the Wikipedia article Kaunas massacre of October 29, 1941, licensed CC BY-SA 4.0.