Fort Lupin, 17th-century artillery battery in Saint-Nazaire-sur-Charente, France

Fort Lupin is a stone artillery battery on the south bank of the Charente, built between 1683 and 1686 to plans by Vauban. Its semi-circular gun battery has twenty-two embrasures for grazing fire over the water, with a tour-réduit and two barracks for twenty-four men each at the gorge. A ditch, covertway and glacis protect the landward side.

Between 1683 and 1686, King Louis XIV ordered its construction to defend the Rochefort naval arsenal from potential attacks. It was part of a wider coastal defense network.

The stone structure reflects the defensive design principles of Sébastien Le Prestre de Vauban, who shaped French military architecture. His approach shows how engineers thought about river protection and cannon placement.

The fort is privately owned, so check the Rochefort Océan tourism office website for available visits and guided tour schedules. Organized tours offer access to areas normally closed to the public.

The fort was decommissioned in the late 19th century, then abandoned and vandalised before a private buyer took it over in 1964. Its owners have since restored the masonry, and the site is now in good condition, though it is not open to the public on a regular basis.