World War II
During World War II, the Battle of the Atlantic saw Germany conducting guerre de course against Britain and its allies, again using U-Boats, auxiliary cruisers, and small groups of warships (raiders).
Limitations set by the Treaty of Versailles meant Germany could not build a large battle fleet as she had in the time leading up to the World War I, and chose to covertly develop her submarines instead. U-boats were cheaper and quicker to build than capital ships, and consequently Germany built up a submarine force rather than a surface fleet. This meant Germany was not able to fight a war of "guerre d'escadre" (battles between fleets), and therefore pursued guerre de course; what small numbers of surface warships Germany possessed, such as the Deutschlands, as well as her auxiliary cruisers, also participated in this strategy. In addition, a number of commercial vessels were converted, perhaps the most famous being Atlantis.
During World War II, elements of the United States Navy based in Brazil conducted operations in the Atlantic against German commerce raiders and blockade runners. In the Pacific, the U.S. Navy operated against Japanese merchant shipping, as well as engaging in offensive operations against ships of the Japanese Imperial Navy. The bulk of the Japanese merchant marine was sunk by American submarines. By the end of the war, only 12% of Japan's pre-war merchant tonnage was still afloat.
The Indian Ocean raid was a naval sortie by the Carrier Striking Task Force of the Japanese Navy from 31 March to 10 April 1942 against Allied shipping and bases in the Indian Ocean. It was an early engagement of the Pacific campaign of World War II.
The staff of the Imperial Japanese Navy decided to send some raiders to Indian Ocean waters during December 12, 1941-July 12, 1942. The Germans had already been operating in the area and conducted mutual aid with Japanese submarines, in the form of re-supply and military intelligence. The Indian Ocean was the largest operating area involving direct contact between the two Axis partners, in which their primary objective was to keep pressure on the shipping lanes. The Japanese Navy participated in some commerce raiding, but concentrated its efforts toward a "decisive battle" in the Pacific, which never took place.
Read more about this topic: Commerce Raiding
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