Fort Chambers (Pennsylvania)
Fort Chambers, often referred to as Chambers' Fort, was a privately-built and garrisoned fort built during the French and Indian War to protect residents of Chambersburg, Pennsylvania. The fort was built in 1756 by Benjamin Chambers at his own expense, initially just to safeguard Chambers' property and family, but it later became a refuge for local settlers.
Source: Wikipedia — Fort Chambers (Pennsylvania) (CC BY-SA 4.0)