The Sherman DD (Duplex Drive) tank was a brilliant innovation; the design and development of a tank that could float and even 'swim' in water was controversial. Each tank was enveloped in a waterproofed canvas screen, launched at sea from landing craft and then 'swam' to shore, where the screens were deflated, allowing the tanks to operate as fighting vehicles. This book discusses the Sherman DD's many variants, including the prototype Valentine DD tank and examines the successes and tragic failures on the beaches of Normandy and further into North-West Europe, including the challenge of crossing the River Rhine.

David Fletcher MBE was born in 1942. He has written many books and articles on military subjects and until his retirement was the historian at the Tank Museum, Bovington, UK. He has spent over 40 years studying the development of British armoured vehicles during the two World Wars and in 2012 was awarded an MBE for services to the history of armoured warfare.