Author 'Boucher Marc dit de Meilh' (Id 154120 ) : Fort St Eynard is located atop Mount Saint Eynard in the Massif de la Chartreuse in Isere. It overlooks Grenoble (38000) to over 1338 meters. This fort built between 1873 and 1879 is a fortification that served to protect the Chartreuse, the villages of Sarcenas of Quaix-en-Chartreuse Saint-Egrève. It then housed 477 men and 25 guns. It extends over 274,410 m². Marc Boucher said Meilhan.