The mitrailleuse is best known for its service with the French Army but in fact it was first used in Belgium in the 1850s as a static weapon to defend the moats of fortresses. It was a 50-barrel needle fire, paper cartridge weapon which had been designed by a Captain T.H.J. Fafschamps. Then, after 1863, it was improved with only 37 barrels, 11×70mmR centerfire ammunition and the weapon's placement on a wheeled artillery carriage. This transformation was carried out as an industrial venture by Christophe and Joseph Montigny of Fontaine-l'Évêque near Brussels, who sought to sell the new weapon to the rest of Europe.