Fort Augusta was a stronghold in Northumberland County, Pennsylvania, in the upper Susquehanna Valley from the time of the French and Indian War to the close of the American Revolution. The fort was erected by Col. William Clapham in 1756 at a site now within the limits of the city of Sunbury, in an area the Indians called "Shamokin." It was first constructed as part of the British defense against the raids of the French and Indians from the upper Allegheny region. Later, it served as an American fortress to aid in protecting settlers of the upper Susquehanna from Britain's Indian allies to the north. Named for Augusta of Saxe-Gotha, the mother of King George III, Fort Augusta was the largest of the Provincial forts. It was dismantled in 1796.