Another example are the Trois-Châtels and Tousey lunettes, both built at the end of the 18th and early 19th centuries, as well as the Rosemont battery built during the war of 1870-1871, the Fort des Montboucons built from 1877 to 1880 and the Fort des Justices built from 1870. A third Lunette d'Arçon was located on the site of Fort Chaudanne; only its tower was preserved during the construction of the fort in the first half of the 19th century.
