Q-ship
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Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant shipswith concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them. The use of Q-ships contributed to the abandonment of cruiser rules restricting attacks on unarmed merchant ships and to the shift to unrestricted submarine warfare in the 20th century.[1]
A solution to this was thecreation of the Q-ship, one of the most closely guarded secrets of the war.Their codename referred to the vessels' home port, Queenstown, in Ireland.[4] These became known by the Germans as a U-Boot-Falle ("U-boat trap"). A Q-ship would appear to be an easy target, but in fact carried hidden armaments. A typical Q-ship might resemble a tramp steamer sailing alone in an area where a U-boat was reported to be operating….
British First World War Q-ship HMS Tamarisk
They were used by the British Royal Navyand the German Kaiserliche Marine during the First World War and by the Royal Navy, the Kriegsmarine, the Imperial Japanese Navy, and the United States Navy during the Second World War (1939–45).
Etymology
Short for Queenstown in Ireland, as Haulbowline Dockyard in Cork Harbour was responsible for the conversion of many mercantile steamers to armed decoy ships in World War One, although the majority appear to have been converted in larger navy yards such as Devonport. [2]
Early uses of the concept
In the 1670s, HMS Kingfisher (1675) was specially designed to counter the attacks of Algerian corsairs or pirates in the Mediterranean by masquerading as a merchantman, hiding her armament behind false bulkheads. She was also provided with various means of changing her appearance.[citation needed]
During the French Revolutionary Wars, a French brig disguised as a merchantman, with hidden guns and most of her crew below decks, was beaten back by the privateer lugger Vulture out of Jersey.[3]: 183 …
https://en.m.wikipedia.org/wiki/Q-ship
False flag
Use in warfare
In land warfare, such operations are generally deemed acceptable under certain circumstances, such as todeceive enemies, provided the deceptionis not perfidious and that all such deceptions are discarded before opening fire upon the enemy. Similarly, in naval warfare such a deception is considered permissible, provided the false flag is lowered and the true flag raised before engaging in battle.[8] Auxiliary cruisers operated in such a fashion in both World Wars, as did Q-ships, while merchant vessels were encouraged to use false flags for protection. Such masquerades promoted confusion not just of the enemy but of historical accounts. In 1914 the Battle of Trindade was fought between the British auxiliary cruiser RMS Carmania and the German auxiliary cruiser SMS Cap Trafalgar, which had been altered to look like Carmania. (Contrary to some accounts, the RMS Carmania had not been altered to resemble the Cap Trafalgar.)
https://en.m.wikipedia.org/wiki/False_flag