War of the U-Boats

From the earliest days of the Second World War, Hitlers U-Boats were unleashed with the mission of sinking as much Allied merchant tonnage as possible. From the sinking of the Glasgow-based ship Olivegrove by U-23, to the end of hostilities six years later officers and seamen of the Merchant Marine played a key role in winning the war by their blatant disregard of the risks from Axis forces. The most dangerous were the U-Boats working unseen but there were also surface raiders and aircraft.All t