In the American Revolutionary War, settlements throughout the Susquehanna Valley, including what is now Old Lycoming Township, were attacked by Loyalists and Native Americans allied with the British. In the early summer of 1778 news came of a group of Native American warriors, perhaps accompanied by Loyalist and British soldiers, heading for the West Branch Susquehanna River Valley to destroy settlements. There were many smaller incidents of violence against settlers, but on June 10, 1778, a party of sixteen settlers was attacked in what is now Williamsport. In what became known as the "Plum Tree Massacre", twelve of the sixteen were killed and scalped, including two women and six children. The Wyoming Valley Massacre occurred on July 3, 1778 (near what is now Wilkes-Barre). This news caused the local authorities to order the evacuation of the whole West Branch valley.