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Origin and history

The fortifications of Aire-sur-la-Lys protected the city from the Middle Ages until its dismantling in 1893. Originally conceived as a castral motte in the eleventh century by the Counts of Flanders, they evolve with the addition of a second castle in the thirteenth century, surrounded by ramparts and ditches. These medieval defences, reinforced in the 14th and 15th centuries, incorporate round towers and watch systems, reflecting the bourgeois organization of urban protection.

In the 16th century, in the face of the emergence of artillery and the conflicts between France and the Habsburgs, Charles Quint modernized the fortifications by adding boulevards and then bastions (Thiennes, door of Arras, gate of Saint-Omer, Notre-Dame). These developments, typical of the bastioned fortification, transform Aire into a strategic stronghold in the Spanish Netherlands. The plans of the engineer Giovanni Maria Olgiati (1553) attest to this transition to structures adapted to the cannons.

The city, which became French after the siege of 1676, benefited from the improvements of Vauban. Between 1682 and 1686, the engineer Gourdin, under his direction, reinforced the defences by counter-fossures, coffers and a flood system on the outskirts. Vauban also supports the removal of certain horned structures in favour of half moons, optimizing door protection. This work is part of the Pre Carré policy, making Aire a centrepiece of the North Defensive System.

In the 18th century, three figures marked the fortifications: Matthieu Demus (counterguard of Thiennes, barracks), Louis Courdoumer (completion of the counterguards), and Étienne Chevalier de Lencquesaing (half moons, guard corps). Their interventions, between 1740 and 1761, completed a network of four counterguards and modernized military infrastructures, such as the barracks of Blanchierie. After 1760, the interview took precedence over innovations, despite annual reports demanding funds.

The dismantling, decided in 1871 but effective from 1893, spread over three years. Despite local resistance and fatal explosive-related accidents, the ramparts give way to boulevards and urban networks (gas, access). The final cost (925 000 francs) far exceeds the estimates, but releases land sold by the city. Today, only remains remain such as the gates of Arras and Saint-Omer, the stronghold of the Chanoes, or the powderbox of the eighteenth century.

Among the preserved elements, the bastion of Beaulieu (17th century) and the powder store (restored in 1991) illustrate the Spanish heritage, while Fort Saint-François (or Gassion) and the barracks rehabilitated in dwellings testify to the civil adaptation of this heritage. The chapel of the fort, moved to La Motte-au-Bois, also symbolizes post-dismantling recompositions. These physical traces recall the city's three seats and its role as a city-border between kingdoms.

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