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Origin and history

The obelisk of Helfaut, located on the plateau of the same name near Saint-Omer (Hauts-de-France), is a memorial erected in 1842. Built in local limestone, it honours the memory of Ferdinand-Philippe d'Orléans, Duke of Orléans and eldest son of King Louis-Philippe. This prince, the founder of the battalions of hunters on foot (future alpine hunters) on this military camp created by the English between 1810 and 1820, tragically perished on 13 July 1842 in a car accident at Neuilly-sur-Seine, as he went to inspect his troops in Helfaut. The building, obelisk-shaped on cubic base, was built in just nine days, between August 11 and 20, 1842.

The site, strategic since the English occupation, housed up to 30,000 soldiers and served as a manoeuvring site for French troops. Close to Saint-Omer, then a major garrison town, the Helfaut camp became a military symbol under the impulse of the Duke of Orléans, who commanded several exercises there between 1833 and 1841. The obelisk, damaged by the Second World War bombings of the nearby Nazi dome (V2 rocket production site), was restored in the 1990s after being desolidated by explosions. Its terter, isolated by the exploitation of the surrounding sand, was listed as historical monuments on 29 November 1985.

The environment of the obelisk, once rich in heathers and specific fauna (hymenoptera, xerophilic ants), has undergone major ecological degradation. The creation of the New Way of the Aa Valley (VNVA) and the industrial exploitation (chalk barrier, paper sludge discharge) have fragmented the plateau, almost completely removing the characteristic moors. Despite proposals in the 1990s to integrate the site with the Landes d'Helfaut Nature Reserve, the municipality refused to grant such protection. Today, the obelisk stands on an artificial mound, surrounded by buried military remains (shooting buds, pond of the fort) and a charmille formerly leading to Blendecques, now cut off by modern amenities.

The monument, owned by the commune of Helfaut, bears witness to both the military history of Nord-Pas-de-Calais and the ecological upheavals linked to industrialization. Its designation to historic monuments in 1985 is intended to preserve this commemorative heritage, while highlighting the challenges of reconciling historical memory, resource exploitation and the protection of local ecosystems. The restoration of the 1990s helped stabilize the structure, but the acidity of the sands and the proliferation of ticks (observed between 1980 and 2000) recall the persistent fragility of the site.

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