The Battle of Wyoming, also known as the Wyoming Massacre, was a military engagement during the American Revolutionary War between Patriot militia and a force of Loyalist soldiers and Haudenosaunee (Iroquois) warriors. The battle took place in the Wyoming Valley of Pennsylvania on July 3, 1778, in what is now Luzerne County. The result was an overwhelming defeat for the Patriots. The battle is often referred to as the "Wyoming Massacre" because of the roughly 300 Patriot casualties, many of whom were killed by the Haudenosaunee as they fled the battlefield or after they had been taken prisoner.