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Merchant raider

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Title: Merchant raider  
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Subject: Indian Ocean in World War II, Ramb II, Commerce raiding, Frank Laskier, Commerce raiders
Collection: Commerce Raiders, Economic Warfare, Naval Warfare, Ship Types
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Merchant raider

RMS Carmania sinking SMS Cap Trafalgar near the Brazilian islands of Trindade, 14 September 1914.

Merchant raiders are armed commerce raiding ships that disguise themselves as non-combatant merchant vessels.

History

Germany used several merchant raiders early in World War I (1914-1918), and again early in World War II (1939-1945). The most famous captain of a German merchant raider, Felix von Luckner, used the sailing ship SMS Seeadler for his voyage (1916-1917). The Germans used a sailing ship at this stage of the war because coal-fired ships had limited access to fuel outside of territories held by the Central Powers due to the Allied blockade.

Germany sent out two waves of six surface raiders each during World War II. Most of these vessels were in the 8-10,000 ton range. Many of these vessels had originally been refrigerator ships, used to transport fresh food from the tropics. These vessels were faster than regular merchant vessels—important for a warship. They were armed with six 15cm (5.9 inch) naval guns, some smaller calibre guns, torpedoes and reconnaissance seaplanes. Some carried mines and gear for minelaying. Some captains demonstrated great creativity in disguising their vessels to masquerade as allied or as neutral merchants. Kormoran sunk the Australian cruiser Sydney in one of the most well-known episodes involving merchant raiders during World War II.

Italy intended to outfit four refrigerated banana boats as merchant raiders during World War II (Ramb I, Ramb II, Ramb III and Ramb IV). In the event, however, only Ramb I and Ramb II served as merchant raiders, and neither ship sunk any enemy vessels. The New Zealand cruiser Leander sank Ramb I off the Maldives (February 1941); Ramb II sailed to the Far East, where the Japanese prevented her from raiding, ultimately took her over and converted her to an auxiliary transport ship. (Ramb III served as a convoy escort and Ramb IV was converted for the Italian Royal Navy to a hospital ship.)

These commerce raiders carried no armour because their purpose was to attack merchantmen, not to engage warships in open combat. Also it would be difficult to fit armour to a civilian vessel. Eventually most were sunk or transferred to other duties.

The British deployed Armed Merchant Cruisers both in World War I and in World War II. Generally adapted from passenger liners, they were larger than the German merchant raiders.

During World War I, the British Royal Navy deployed Q-ships to combat German U-boats. Q-ships were warships posing merchant ships so as to lure U-boats to attack them; their mission of destroying enemy warships differed significantly from the raider objective of disrupting enemy trade.

See also

External links

  • September 1941Merchant Ships Convert Into War Raiders, Paint And False Structures Provide Disguises article details how Merchant Raiders operate in wartime
  • Marauders of the Sea, German Armed Merchant Raiders During World War 1, Wolf
  • Marauders of the Sea, German Armed Merchant Raiders During World War 1, Möwe
  • Hilfskreuzer
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