This book will make you discover the history of the 78 German submarines passed by the port of Lorient from July 41 to July 42. It will explain the major phases of the Battle of the Atlantic to which they were linked and particularly the attack surprise of the commercial traffic on the American coasts. He will detail the allied actions against the port of Lorient and their defense system against the German submarine weapon. This book is punctuated by several unpublished testimonials from submariners about life on land in Lorient when they arrive or leave on a mission. It will make you know two special missions of landing of agents and saboteurs from submarines gone from Lorient to Canada and the United States ... This book is illustrated by more than 400 photos of exceptional times very precisely captioned and by 10 maps and plans. A color notebook allows to discover vestiges, documents and memories related to the presence of U-Boote in Lorient. An essential book for all fans of the Battle of the Atlantic, submarines or the history of the port of Lorient.