Gnadenhütten massacre (Pennsylvania)
The Gnadenhütten massacre was an attack during the French and Indian War in which Native allies of the French killed 11 Moravian missionaries at Gnadenhütten, Pennsylvania (modern day Lehighton, Pennsylvania) on 24 November 1755. They destroyed the mission village and took one woman prisoner, and only four of the sixteen residents escaped.
Source: Wikipedia — Gnadenhütten massacre (Pennsylvania) (CC BY-SA 4.0)