Originally published in 1943 by the Military Intelligence Division, United States War Department. The aim of this study is to provide a digest of German principles of modern fortifications and the available information concerning the various lines of permanent and field fortifications which Germany had constructed within and outside her frontiers. The paper details the German principles of fortifications (strategic, tactical, and excerpts from "the stabilized front") and German fortified systems (interior and coastal defenses and the West Wall). Please note these are copies of important historical documents that have been extensively cleaned up by the publisher. While every effort has been made to make these books accessible they sometimes reflect the nature of the age of the originals including the typefaces, print quality and occassional marginalia. These are not poor quality OCR documents with missing pages or tracts illegible text.