Fort Central de la dike du Large

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Heritage classified

Key figures

Origin and history

Fort Central de la dike du Large is an integral part of the defensive system of the Cherbourg harbour, the second largest artificial harbour in the world after Ras Laffan. Its construction is part of an ambitious project launched under Louis XVI in 1783, aimed at securing a military port capable of sheltering 80 warships. The 3,640-metre long central dam was completed in 1853, while the three forts that stowed it, including Fort Central, were operational in 1860. This fort, of elliptical shape, was built at the site of an old battery named Napoleon, destroyed in 1808 by a storm, and rebuilt from 1811 under Napoleon I.

Fort Central features an open-air structure with a two-storey burnout, designed to withstand maritime assaults. As early as 1807, it welcomed twenty cannons, but the storm of February 1808 seriously damaged the initial battery. A decree of 1811 ordered its reconstruction, with flames raised nine metres above the tides. The fort played a key role in the Second World War: it capitulated on 29 June 1944 after an American aerial bombardment, marking the end of the Battle of Cherbourg. Its architecture reflects the successive adaptations to the progress of artillery, typical of the 19th century coastal fortifications.

The Cherbourg harbour, of which the Central Fort is a central element, illustrates the evolution of French military and port techniques. Designed to counter English threats, it became a major strategic issue, notably under Napoleon I and Napoleon III. The dykes, more than six kilometers long, are complemented by forts such as those of Pelee Island, Querqueville or Chavagnac, forming a coherent whole. Ranked a Historic Monument in 2021, Fort Central bears witness to the defensive engineering of the 19th century and Norman maritime history.

The fort was associated with several notable engineers, including Louis-Alexandre de Cessart, whose initial plans (wood cones filled with stones) failed in the face of storms, and Joseph Cachin, who supervised the completion of the work under Napoleon. The broad dyke, 100 metres wide at its base, is a technical feat for the era, combining rock and masonry. Fort Central, although less publicized than other works in the harbour, embodies the persistence of French military projects over more than a century, despite political upheavals and technical challenges.

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