Gordon Williamson was born in 1951 and currently works for the Scottish Land Register. He spent seven years with the military Police TA and has published a number of books and articles on the decorations of the Third Reich and their winners. He is author of a number of World War II titles for Osprey.

Ian Palmer is a highly experienced digital artist. A graduate in 3D design, he has provided illustrations for many publications, from modelling James Bond's Aston Martin to recreating lunar landings. He lives and works in London with his wife and three cats.

As was the case in World War II, one of the greatest threats to Britain during World War I was the German U-boat menace. This book traces the development of the U-boat threat from the Brandtaucher, designed by Wilhelm Bauer, the father of the German submarine arm, in 1850, through to the commissioning of Germany's first U-boat to go into service, the U-1, in 1906. It then covers the main types of World War I U-boat, detailing the operational history of the U-boat service in depth, with a particular focus on the campaigns in the Atlantic and Mediterranean, as well as the slow build up of anti-submarine measures by the allies.