sentences:  It featured a drawbridge defended by a 
  casemate and two bastions.Remains of the main gate and of the casemate still exist, but are enclosed in the military area, and not accessible to the general public.From 1914 to 1919, Île Longue was used as an internment camp for German citizens captured after the seizure of the ship "Nieuw Amsterdam", intercepted by the French 2nd Light Squadron on 2 September 1914.