Published by the Memorial Museum Passchendaele in 2016 in Dutch as Bouwen aan het front, this book examines how the German army developed field fortifications to hold what can loosely be described as the Ypres Front. With the decision by Falkenhayn in 1915 to concentrate Germany’s offensive efforts largely in the east, the German defenders around Ypres set to developing their lines for semi-permanent occupation. The sub soil around the Salient generally made it difficult to construct and maintain mined (i.e. deep) dugouts - unlike on, for example the Somme, with easily worked chalk not far below the surface. The only practicable alternative was to use reinforced concrete. In this book the authors (both with many years of experience in researching and working on matters Great War, particularly the German army in Belgium) have examined in detail an impressive range of primary sources to provide a narrative of what the Germans built, how they built it (the logistical challenge was enormous) and how the designs and requirements of bunkers (for example, forward medical bunkers, artillery shelters, machine gun and observation bunkers) changed as the war progressed and as the military situation on the front dictated. There are many photographs, largely unseen by British readers, design diagrams and maps to supplement the text; whilst the activities of selected particular formations are examined in detail to provide an example of the effort that was put into the work. Additions to the Dutch edition will include a tours section, taking a visitor to accessible remaining structures in the Salient area; and a glossary of terms and their English equivalent. The book will be in full color throughout.