When the German Army invaded USSR on 21 June 1941, the Soviet authorities were taken completely by surprise. At a stroke the European diplomatic situation was transformed, and Britain, hitherto standing alone against Hitler, found herself with an ally of huge potential.
For the six years between 1939 and 1945, Naval action was seen on every ocean of the world.
During the Scond World War the major Navies, with the most potent weapons ofwar development in the twentieth century