The
Thiers wall was the last of the defensive
walls of Paris. It was an enclosure constructed between 1841 and 1844 under a law enacted by the government of the French prime minister,
Adolphe Thiers. It covered , along the "boulevards des Maréchaux" (
Boulevards of the Marshals) of today. A sloping area outside the wall, called a
glacis, extended outward from the Thiers wall to the location of today's
Boulevard Périphérique. The wall was demolished in stages between 1919 and 1929.