Question: At the time of its construction, Fort des Ayvelles, controlled Meuse and the railway line linking what city in the Grand Est region of France, that lies 129 km east-northeast of Paris?
Sentence (from "Fort des Ayvelles"): As part of the Séré de Rivières system of fortifications, the fort was planned as part of a new ring of forts replacing the older citadel of Mézières with dispersed fortifications.
Relevant evidence: No