Massacre of the First Sapper Battalion
1948 CE.
Shown on the map at 37.701°, 24.125°.
The massacre of the First Sapper Battalion was the mass murder of 350 Greek soldiers imprisoned in the Makronisos prison island perpetrated by the camp guards and prisoner functionaries belonging to the Third Sapper Battalion. The massacre took place between 29 February and 1 March 1948, during the Greek Civil War.
Text from the Wikipedia article Massacre of the First Sapper Battalion, licensed CC BY-SA 4.0.