The province of Western Flanders in Belgium contains a particular kind of heritage and archaeological resources: the extensive remains of military activity on an unprecedented scale and intensity during World War I. Of the long portion of the famous Western Front (in which German and Allied forces faced each other in a statemate of trench warfare from 1914-1918), crossed Belgium from Nieuwpoort (Nieuport) to Mesen (Messines), the so-called Ypres Salient is one of the better known parts. Until recently, however, systematic archaeological excavations of World War remains has been highly localised. Now conditions have enabled to conduct more thorough surveys and undertake more extensive excavations. We would like to bring some of the most important results.