There were eight frontier forts in Scott County, Virginia territory built to provide protection against Indian raids and for use as stopping places for hunters and settlers:
Blackmore’s Fort, overlooking the Clinch River, was built by Capt. John Blackmore in 1772. It was attacked by Indians many times and several people were killed or captured near the fort. Daniel Boone was in command of Fort Blackmore and other forts on the Clinch in 1774 while the militia was engaged in the battle of Point Pleasant during Dunmore’s war.
Huston’s [Houston's] Fort was built in 1774 on the waters of Big Moccasin Creek by William Huston [Houston] on land assigned to him by Thomas McCulloch. McCulloch had established the first Scott County territory settlement there in 1769, but was forced out by Indians. In 1776 Fort Huston was attacked by an Indian force estimated to be near 300.
Porter’s Fort was built by Patrick Porter in 1775 on Falling Creek near present-day Dungannon. He built a grist mill there which was most likely the first mill in Scott County territory.
Other forts were Carter’s Fort located in Rye Cove, Duncan’s Fort on the Clinch River, Dorton’s Fort east of present Nickelsville, the Anderson Blockhouse located near the North Fork of the Holston River and Moccasin Gap, and Kilgore’s Fort built on the waters of Copper Creek west of Nickelsville.
(Source: Wilderness Road: Virginia's Heritage Migration Route)