Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with 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.
USS Prudent (PG–96), originally ordered as HMS Privet, was an Action-class patrol gunboat in the United States Navy.
USS Fairfax (DD-93) was a Wickes-class destroyer in the United States Navy during World War I, later transferred for World War II service first to the Royal Navy as HMS Richmond (G88), a Town-class destroyer, and then to the Soviet Navy as Zhivuchy.
The first USS Twiggs (DD–127) was a Wickes-class destroyer in the United States Navy during World War I. She was named for Major Levi Twiggs. She was later transferred to the Royal Navy, as HMS Leamington and to the Soviet Navy as Zhguchy, before returning to Britain to star in the film The Gift Horse, which depicts the St. Nazaire Raid.
USS Crowninshield (DD–134) was a Wickes-class destroyer in the United States Navy between World War I and World War II. She was named for Benjamin Williams Crowninshield. In World War II she was transferred to the Royal Navy where she was named HMS Chelsea, and subsequently to the Soviet Navy where she was named Derzky.
USS Natchez (PG-102/PF-2) was a River-class frigate acquired by the U.S. Navy during World War II. She was originally ordered and laid down as HMS Annan for the Royal Navy, and renamed as HMCS Annan for the Royal Canadian Navy before transfer to the U.S. Navy before launch. She was used for anti-submarine patrol work during the war.
USS Alacrity (PG-87) was an Action-class patrol boat acquired by the United States Navy for the task of patrolling American coastal waters during World War II.
USS Surprise (PG-63), the fourth American naval ship of the name, was a Temptress-class patrol gunboat during World War II. She was built as the British Flower-class corvette HMS Heliotrope, and was in service with the Royal Navy during the first years of the Battle of the Atlantic. She was loaned to and operated by the United States Navy from 1942 to 1945. After World War II, she was sold as a merchant vessel and ended her life in the Chinese navy as Lin I.
HMS Begonia was a Flower-class corvette that served in the Royal Navy during World War II. In 1942 she was lent to the United States Navy and commissioned as USS Impulse. Returned to the Royal Navy in 1945, Begonia was stricken and sold into merchant service. She was wrecked off the coast of Spain in 1970.
USS Asheville (PF-1) was an Asheville-class patrol frigate of the United States Navy that served during World War II. She was laid down on 10 March 1942 by Canadian Vickers Ltd. in Montreal, Quebec, Canada as the River-class frigate HMS Adur (K296) to serve in the British Royal Navy. She was launched on 22 August 1942 but due to a lack of American vessels for convoy protection she was transferred to the United States Navy prior to completion. On 1 December 1942, she was commissioned in Montreal as USS Asheville (PG-101), a patrol gunboat. She was reclassified PF-1 on 15 April 1943.
HMS Arabis was a Flower-class corvette of the Royal Navy. The ship was commissioned into the Royal Navy as HMS Arabis. She was transferred to the United States Navy in 1942, serving as USS Saucy. Returned to the United Kingdom in 1945, she was recommissioned into the Royal Navy as HMS Snapdragon.
USS Action (PG-86) was the lead ship of the Action-class patrol boats acquired by the United States Navy for the task of patrolling American coastal waters during World War II. She is the only ship to bear this name.
HMS Flax, a modified Flower-class corvette, was laid down on 28 February 1942 at Kingston, Ontario, Canada, by War Supplies Ltd., for the Royal Navy. Launched on 15 June 1942 it was reallocated to the United States under the so-called "Reverse Lend-Lease" program and renamed and redesignated Brisk (PG-89) on 14 August 1942. Completed on 5 December 1942, the ship was commissioned on 6 December 1942.
USS Haste (PG-92), was one of a group of Canadian corvettes turned over to the United States Navy and manned by the Coast Guard. She was laid down as CN-310 by Morton Engineering & Dry Dock Co., Quebec City, Canada, and launched on 22 August 1942 as HMS Mandrake. She was taken over by the US Navy, renamed Haste and commissioned on 6 April 1943.
USS Pert (PG-95), the second United States Navy ship of that name, was one of eight Canadian-built corvettes turned over to the U.S. Navy for operation by the United States Coast Guard. She was laid down by Morton Engineering and Dry Dock Co., Ltd., Quebec, Canada, 22 July 1942; launched 27 November 1942; and commissioned at Quebec 23 July 1943.
HMS Ascension (K502) was a Colony-class frigate of the United Kingdom that served in the Royal Navy during World War II. She originally was ordered by the United States Navy as the Tacoma-class frigateUSS Hargood (PF-74) and was transferred to the Royal Navy prior to completion.
HMS Nyasaland (K587) was a Colony-class frigate of the United Kingdom that served during World War II. She originally was ordered by the United States Navy as the Tacoma-class patrol frigateUSS Hoste (PF-83) and was transferred to the Royal Navy prior to completion.
HMS Veronica was a Flower-class corvette, built for the Royal Navy during the Second World War, and was in service in the Battle of the Atlantic. In 1942 she was transferred to the United States Navy as part of the reverse Lend Lease arrangement and renamed USS Temptress, the name ship of the Temptress-class gunboats. With the end of hostilities she was returned to the Royal Navy and sold into mercantile service.
HMS Calendula was a Flower-class corvette, built for the Royal Navy during the Second World War, and was in service in the Battle of the Atlantic. In 1942 she was transferred to the United States Navy as part of the reverse Lend Lease arrangement and renamed USS Ready, one of the Temptress-class gunboats. With the end of hostilities she was returned to the Royal Navy and sold into mercantile service.
HMS Candytuft was a Flower-class corvette, built for the Royal Navy during the Second World War, and was in service in the Battle of the Atlantic. In 1942 she was transferred to the United States Navy as part of the reverse Lend Lease arrangement and renamed USS Tenacity, one of the Temptress-class gunboats. With the end of hostilities she was returned to the Royal Navy and sold into mercantile service.
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