The experience of easy capture of the town led the authorities to strengthen the sector of the fortifications by which had the Imperials had attacked in 1712. A huge hornwork, unique in the world, was then built to protect the vicinity called Fauroeulx and the gate of the same name. The work in question divided the supply ponds into two, known today under the names of The Red Bridge Pond and The Blessed Pond. These two ponds supplying water to flood the ditches in case of siege, were supplemented by two other ponds no longer exist (the pond d’Aulnoye and that of L’Ecaillon in the forest of Mormal).