At the outbreak of World War II the German Kriegsmarine still had a relatively small U-boat arm. To reach Britain''s convoy routes in the North Atlantic, these boats had to pass around the top of the British Isles - a long and dangerous voyage to their "hunting grounds". Germany''s larger surface warships were much better suited to this kind of long-range operation. So, during late 1939 the armoured cruiser Deutschland, and later the battlecruisers Scharnhorst and Gneisenau were used as commerce raiders, to strike at Allied convoys in the North Atlantic. These sorties met with mixed results, but for Germany''s naval high command they showed that this kind of operation had potential. Then, the fall of France, Denmark and Norway in early 1940 dramatically altered the strategic situation. The Atlantic was now far easier to reach, and to escape from. During 1940, further moderately successful sorties were made by the cruisers Admiral Scheer and Admiral Hipper
