In both World Wars I and II, the German U-boat was the Allies' scourge, and in the latter conflict it very nearly won the day for the Nazis. Over a thousand of these powerful ships were destroyed in air and seaborne attacks, by surface vessels and submarines, in tough head-to-head encounters, chance meetings, and after extensive chases and hunts. Here is unprecedented detail of these sinkings and obliterations, of casualties on a massive scale, and of a victory hard-won. 256 pages, 6 x 9.