Uncasville is an area in the town of Montville, Connecticut. The area traditionally known as Uncasville is a village in southeastern Montville, at the mouth of the Oxoboxo River. The name is now applied more generally to all of the east end of Montville, which is the area served by the Uncasville ZIP code, including the Mohegan reservation in northeastern Montville that is the site of the Mohegan Sun casino resort and the Mohegan Sun Arena. Uncasville takes its name from Uncas, the 17th-century Mohegan sachem. Uncas established a fortified village for defense against the Pequot, now known as Fort Shantok, on an elevated site next to the Thames River near what is now the Mohegan Sun resort. He later was to welcome English colonial settlers to the Mohegan lands. The village of Uncasville was the site of the first woolen mill in the United States, established by brothers John and Arthur Schofield. Their carding and spinning mill was located at the outlet of the Oxoboxo River.