Enoch Brown school massacre
1764 CE.
Shown on the map at 39.825°, -77.756°.
On July 26, 1764, four Delaware (Lenape) Native Americans entered a settlers' log schoolhouse in the Province of Pennsylvania and killed the schoolmaster, Enoch Brown, and ten students. One other student named Archie McCullough was wounded. Historian Richard Middleton described the massacre as "one of the most notorious incidents" of Pontiac's War.
Text from the Wikipedia article Enoch Brown school massacre, licensed CC BY-SA 4.0.