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 7,802 hectares (19,280 acres), 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.
Louis-Philippe, proclaimed king of the French in 1830, was convinced that the key to defence of France was to prevent Paris from falling too easily into the hands of foreign armies as happened during the Battle of Paris in 1814. So he conceived the project of building around the city an enclosure of walls that would make the city impregnable.
A first draft was presented to the Chamber of Deputies in early 1833 by Marshal Soult, Council President and Minister of War. It immediately sparked a fierce resistance from the left, whose speakers suspected, or pretended to suspect, that the government had ulterior political motives: that the fortifications were, in fact, designed not to defend France, but to threaten the Parisians in case they come to revolt against the monarchy.
The 33 kilometres (21 mi) long enclosure, colloquially referred to as "the fortress", consisted of 94 bastions, 17 gates (French: "portes", major road crossings), 23 minor road crossings (French: "barrières"), eight railway crossing points, five crossing points of rivers or canals and eight posterns. The only existing remains are the Poterne des Peupliers ("postern of the poplars") between the Porte de Gentilly and Porte d'Italie near where the Bievre entered Paris, bastion number 1 in the middle of the Porte de Bercy interchange, bastion number 45 at the Porte de Clichy, a wall at the Porte de la Villette, part of the Porte d'Arcueil and various smaller remains.
The works were serviced and supplied by the Rue Militaire (military road), supported by a railway line, the Chemin de fer de Petite Ceinture (French for "little belt railway").
The decommissioning of the enclosure
Having become useless due to progress in military technology, the fortifications were demolished beginning in 1919. Their locations first became vacant lots, often referred to as the "zone". It was progressively rehabilitated from 1930 by the construction of community housing for the poor and sports facilities.
The shape of the former strongholds are marked in several places in the topology of roads into this area.
The "zone" was not itself the site formerly occupied by the wall, but a strip of land where no building was permitted in front of the wall, a ditch and a slope which measured 250 meters across. It was designated as an area where building was not permitted and it was occupied by slums at the end of the 19th century, with the abandonment of its military function. The French slang "zonard" ("lad" in a pejorative sense) derives from the "zone".
The Boulevard Périphérique (Paris ring road) is built on the route of the Thiers wall and continues to separate Paris and its suburbs.
The fortifs zone, in Saint-Ouen
- Gagneux, Renaud; Denis Prouvost (2004). Sur les traces des enceintes de Paris ("Tracing the old walls of Paris") (in French). Parigramme.
- Hillairet, Jacques. Dictionnaire historique des rues de Paris (Historical Dictionary of Paris streets) (in French).
- le Hallé, Guy (1995). Histoire des fortifications de Paris et leur extension en Île-de-France ("History of the fortifications of Paris and its extension in Ile-de-France) (in French). Éditions Horvath.
- Guy le Hallé, in "Paris aux cent villages", La Ballade des Fortifs, numbers 34 to 45 (in French)
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