A 1383 siege of this city by the English helped cause a decline which saw its population dwindle from 80,000 to 5,000.  
A 1383 siege of this city by the English helped cause a decline which saw its population dwindle from 80,000 to 5,000.  Its 140 cemeteries include the tomb of Cornelius Jansen as well as the bodies of many who died in Douglas Haig's Passchendaele Campaign and in an earlier battle which saw the first large-scale use of chlorine gas on the battlefield.  FTP, name this Belgian city, near which there were over 850,000 casualties in three battles during World War I.
A 1383 siege of this city by the English helped cause a decline which saw its population dwindle from 80,000 to 5,000.  
Ypres (or Ieper)