Fort Frederica on St. Simons Island, Georgia, preserves the remains of an eighteenth-century British fort and town founded by James Oglethorpe to protect Georgia’s southern frontier from Spanish Florida. Built by colonists from England, Scotland, and the Palatinate, it included a garrison of about 630 troops and a town of up to 1,000 residents laid out under the Oglethorpe Plan. The site stood in a long-contested borderland and reached peak importance in 1742, when Oglethorpe’s forces repelled Spanish attacks at Bloody Marsh and Gully Hole Creek, ending the Spanish threat to Georgia. Later archaeological work made it a key source for understanding colonial Georgia and British-Spanish rivalry in the Southeast.