On July 3, the British spotted the American militia near Forty Fort. Butler wanted to lure the Americans away from their fortifications. He ordered for Fort Wintermute to be set ablaze. The Patriots, believing it signified a British retreat, advanced rapidly. British soldiers, with the assistance of about 700 Native Americans, ambushed the oncoming American militia in and around the present-day Exeter and Wyoming. In the end, nearly 300 Wyoming Valley settlers were killed in what would be known as the Wyoming Massacre. On July 4, the American colonel, Nathan Denison, agreed to surrender Forty Fort along with several other posts.