Bosansko Grahovo massacre
1941 CE.
Shown on the map at 44.180°, 16.360°.
The Bosansko Grahovo massacre was a massacre of Croat civilians was committed by local Chetnik rebels on 27 July 1941 in the village of Bosansko Grahovo.
Text from the Wikipedia article Bosansko Grahovo massacre, licensed CC BY-SA 4.0.