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The French had suffered 5,000 casualties and up to 49,000 troops went into captivity, along with several hundred guns and machine-guns; German casualties were 1,100–5,000 men. The garrison had withstood bombardment by heavy and super-heavy artillery, air raids and infantry attacks for fifteen days, longer than any other besieged fortress in Belgium or France, leaving the German 2nd Army short of troops as it pursued the Franco-British Armies southwards towards the Marne. After the Franco-Prussian War of 1870–1871 the French built more fortresses on the German border and extended the frontier fortifications northwards with new building at Hirson, Maubeuge, Lille and Dunkirk. Raymond Adolphe Séré de Rivières oversaw the creation of a ring fortress, le camp retranché de Maubeuge (the Entrenched Camp of Maubeuge) with the construction of six forts and seven intermediate fortifications (ouvrages, fortified shelters). The town walls, 500–600 m (550–660 yd) in diameter, had been built by Marshal Sébastien de Vauban in the seventeenth century. Forts de Boussois, des Sarts, de Leveau, d'Hautmont, du Bourdiau and Fort de Cerfontaine were built about 3–6 km (1.9–3.7 mi) beyond the city walls, on a circumference of about 32 km (20 mi). The forts were pre-1885 masonry types except for du Bourdiau, which had a concrete shell, capable of resisting some modern heavy artillery.
The masonry forts had a covering of earth 3 m (9.8 ft) thick, except for Le Sarts, which had a clay layer only .5 m (1.6 ft) thick; the forts made prominent landmarks. Ouvrages (fortified infantry shelters) had been built in the wide gaps between the forts, except between Boussois and Le Sarts where two were built. Ouvrage de Rocq in the south-east had an infantry parapet and some masonry shelters, the other ouvrages were low concrete shelters with provision for seating. The forts had no ancillary services like kitchens or first aid posts and water was drawn from a well, which could easily be blocked by artillery fire. The forts contained 80–90 guns which had no overhead cover, making them vulnerable to counter-battery fire, except Boussois and Fort de Cerfontaine, which had two cast iron Menon 155 mm gun turrets and three 75 mm turrets; none of the forts were linked to the citadel. Brigadier-General Henri Fournier, an engineer, was appointed Governor on 17 March 1914. His inspection revealed that the defences were in a very poor state and he galvanised the garrison to restore the defences, believing that war with Germany was inevitable. The main zone of resistance was given priority, to stop a German advance well outside the town. Work went on round the clock and new positions were built to close the gap between Fort de Boussois and Le Salmagne. Gaps between ouvrages La Salmagne, Bersillies, Gréveaux and ouvrages Ferriére la Petite and de Rocq were blocked by strengthening the existing fortifications.
