Between June 1940 and the spring of 1941 Britain - particularly south-east England - was covered by a vast system of anti-invasion defences. The legacy of these defences can still be seen across the landscape - anti-tank gun emplacements, pillboxes, spigot mortars, coastal gun batteries, anti-tank blocks and anti-tank ditches. During his fieldwork for a two-year English Heritage/Council for British Archaeology project, the author made 20 journeys throughout the south-east, central south and east of England. This book is a personal record of his discoveries, which will not only inform and entertain the reader but contains a great deal of information on how to make similar discoveries on ones own.