In 1769, Patrick Porter and his family, William and Edward Russell, and a party led by John Morgan (consisting of the Walker sisters and their husbands, William and Andrew Cowan, James Smith, William Trimble, James Wharton, Fredrick Fraley, Joseph Moore, James Anderson, three Dickenson brothers, and Col. John Snoddy) moved to the area called "Castle's Woods," which was settled earlier by Jacob Castle. The group soon built Snoddy's Fort, later called Moore's Fort, the largest on the Clinch River.
In 1772, Porter and his family, along with Raleigh Stallard, Capt. John Montgomery (Porter's son-in-law,) Samuel Porter, and Charles Kilgore moved to Porter's land survey at Falling Creek near present day Dungannon, Virginia. Shortly they set to building a fort, called Porter's Fort, nearby. In 1774 Patrick Porter added a mill, the first on the Clinch, where Falling Creek spills over a cliff near the river.