Investigating the logistical and political problems of supplying and manufacturing large structures using immense quantities of labour and materials, this is a study of the development and use of shell-proof protection for both sides in World War I. It explains how both adversaries in the conflict designed and developed patterns and fast-track systems, and goes on to describe how these were used in defence schemes to provide administrative and command centres, aid stations and artillery observation posts, as well as machine-gun posts. The book includes a gazetteer listing the remaining pillboxes and bunkers in Belgium and northern France, and many of the entries include historical details and information on their use in specific battles.