Leroy Massacre - PLAQUE. John Jacob Leroy was killed by the Indians near this spot during the time of the Penns Creek Massacre, October 16, 1755. This was the first act of hostility by the Indians of this Province following the defeat of General Braddock, July 9, 1755. A daughter of John Jacob Leroy, Marie, and Barbara Leininger were taken to the Muskingum in Ohio...