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Origin and history

The German compound of Strasbourg was built between 1872 and 1884 after the annexation of Alsace by the German Empire in 1871, as part of a vast urban extension and militarization project. Strasbourg, which became the capital of the Reichsland Elsass-Lothringen, was equipped with a discontinuous fortified belt of 14 forts detached (located 8-9 km from the centre) and a continuous urban enclosure of 11 km, designed according to the principles of the "New Prussian" polygonal fortification. This rampart, 12 metres high and 40 metres wide at its base, included barracks, powder shops and battled caponières, all preceded by a floodable ditch and an inconstructible 500-metre glaze. The objective was twofold: to protect the city from French fire and affirm German domination by monumental architecture, mixing military utility and imperial symbolism.

The design of the enclosure reflected the technological advances of the time, with laminate iron laminates (made in England) and water ditches to counter modern artillery. However, its effectiveness was quickly challenged by the evolution of the explosive shells after 1885, requiring concrete reinforcements. During the First World War, Strasbourg, far from the front, served as a logistical and hospital base, while its forts, emptied of their artillery, became prisoner camps. After 1918, the enclosure was decommissioned (Laws of 1922 and 1927) and partially demolished to free urban spaces, leaving only a few classified remains, such as bastions 11, 14-17 or the Kriegstor (war gate).

The enclosure was part of a wider defensive network including the Kaiser Wilhelm II Festival in Mutzig (20 km west), designed to block the Alsace plain. Its route followed the streams (Ill, Aar, canal of the Marne-au-Rhin) and included monumental doors stylized in "neo-roman", such as the Schiltigheim Gate or the Kehl Gate. These improvements reflected Germany's desire to Germanize urban space, while meeting strategic requirements: to control rail and river routes, and to maintain a permanent garrison (15 000 men in 1914).

The gradual deterioration of the enclosure (1919-1939) allowed the expansion of Strasbourg, with the creation of boulevards (such as the current boulevards of the Victoire or Wilson) and residential districts in old military areas. The last vestiges, such as Bastion No. 14 (now artist's workshop) or the walls of the military hospital (pastor quays), bear witness to this period when Strasbourg was a model Festung (place fort) of the Second Reich. Its urban heritage remains visible in the "green belt" (old glacis) and the radial axes converging towards the old doors.

Architecturally, the enclosure combined technical innovation (steel cooks, flood systems) and historic aesthetics, with doors inspired by the Rhine medieval castles. Local materials (Vosges sandstone, bricks) were preferred, while ditches also served as waterways for trade. Despite its military obsolescence in the 1900s, it played a key role in the transformation of Strasbourg into a regional metropolis, lastingly marking its landscape and identity, between French heritage and German imprint.

Today, the rare preserved elements (such as the Caponnière du bastion 17 or the walls of the hospital) have been protected as historical monuments since 2009 and 2012. They recall a time when Strasbourg, a disputed frontier city, was a military urban planning laboratory, where strategic challenges, imperial ambitions and social change intersected. The enclosure thus illustrates the duality of the city, both European crossroads and symbol of Franco-German tensions from the 19th to the 20th century.

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