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.
During the 18th and 19th centuries, a sloop-of-war was a warship of the British Royal Navy with a single gun deck that carried up to 18 guns. The rating system of the Royal Navy covered all vessels with 20 or more guns; thus, the term encompassed all unrated warships, including gun-brigs and cutters. In technical terms, even the more specialised bomb vessels and fire ships were classed by the Royal Navy as sloops-of-war, and in practice these were employed in the role of a sloop-of-war when not carrying out their specialised functions.
The Flower-class corvette was a British class of 294 corvettes used during World War II by the Allied navies particularly as anti-submarine convoy escorts in the Battle of the Atlantic. Royal Navy ships of this class were named after flowers.
The twenty-eight Anchusa-class sloops were built under the Emergency War Programme for the Royal Navy in World War I as the final part of the larger "Flower class", which were also referred to as the "Cabbage class", or "Herbaceous Borders".
HMS President is a retired Flower-class Q-ship that was launched in 1918. She was renamed HMS President in 1922 and moored permanently on the Thames as a Royal Navy Reserve drill ship. In 1982 she was sold to private owners and, having changed hands twice, served as a venue for conferences and functions as well as the offices for a number of media companies. She has been moved to Chatham on the Medway in Kent since 2016, but is due to return to the capital. She had the suffix "(1918)" added to her name in order to distinguish her from HMS President, the Royal Naval Reserve base in St Katharine Docks. She is one of the last three surviving Royal Navy warships of the First World War. She is also the sole representative of the first type of purpose built anti-submarine vessels, and is the ancestor of World War II convoy escort sloops, which evolved into modern anti-submarine frigates.
The Azalea class of twelve minesweeping sloops were built under the Emergency War Programme for the Royal Navy in World War I as part of the larger Flower class, which were also referred to as the Cabbage class, or "Herbaceous Borders". The third batch of twelve ships to be ordered in May 1915, they differed from the preceding Acacia class only in mounting a heavier armament. One ship, converted to a Q-ship was lost during the war, another during the Allied intervention in the Russian Civil War in 1919. With the exception of two others, the rest were scrapped. One entered mercantile service, while the other was transferred to the Belgian Navy. Both were captured by the Germans during World War II and put into German service. One was lost with the final ship being scrapped in 1952
The Aubrietia-class sloops were a class of twelve sloops built under the Emergency War Programme for the Royal Navy in World War I as part of the larger Flower class. They were also referred to as the "cabbage class", or "herbaceous borders". The Flowers were the first ships designed as minesweepers.
HMS Chrysanthemum was an Anchusa-class sloop of the Royal Navy, launched on 10 November 1917. She received a Le Cheminant chronometer from the Royal Observatory on 15 May 1925. After service in the Mediterranean, in 1938 she became a drill ship with Royal Naval Volunteer Reserve (RNVR) and then the Royal Naval Reserve (RNR). She was sold in 1988 to private owners and subsequently scrapped in 1995.
HMS Arabis was an Arabis-class sloop of the Royal Navy. She had a brief career, serving during the First World War.
HMS Snowdrop was an Azalea-class sloop of the Royal Navy. She served during the First World War. Snowdrop survived the war and was sold for scrap in 1923.
SS Ardena was a minesweeper and escort vessel built as an Azalea-class sloop minesweeper for the British Royal Navy with the name HMS Peony in 1915.
HMS Aubrietia (K96) was a Flower-class corvette built for the Royal Navy (RN) from 1941-1946. She was active as a convoy escort in the Atlantic and Mediterranean. In May 1941, Aubrietia sighted and depth charged the German submarine U-110, leading to its capture and the seizure of a German Naval Enigma and its Kurzsignale code book.
HMS Aubrietia was one of 12 Aubrietia-class sloops completed for the Royal Navy and was launched in 1916. During World War I, she functioned as a Q-Ship and served under the name Q.13, also taking the names Kai, Winton and Zebal. Aubrietia was part of the 1st Sloop flotilla, based in Queenstown and subsequently, the 3rd Sloop Flotilla in the North Sea.
HMS Gentian was an Arabis-class sloop that was sent to assist the Baltic States and their fight for independence. While clearing mines on 15 or 16 July 1919, according to different sources, Gentian and the sloop HMS Myrtle both hit mines and sank with the loss of nine sailors.
HMS Myrtle was an Azalea-class sloop that was part of a Royal Navy squadron that was sent to assist the Baltic States and their fight for independence. While clearing naval mines on 16 July 1919 both Myrtle and HMS Gentian hit mines and sank. The two blasts killed nine sailors.
HMS Zinnia was an Azalea-class minesweeping sloop of the Royal Navy, built in 1915 at the Swan Hunter & Wigham Richardson yard, at Wallsend in the United Kingdom.It was sold to Belgium on 19 April 1920 to join their new Corps of Destroyers and Sailors.
HMS Cornflower was an Arabis-class sloop of the Royal Navy and from 1933 the Hong Kong Naval Volunteer Force (HKNVR).
HMS Rosemary was an Arabis-class minesweeping sloop of the British Royal Navy. Built by the Teesside shipbuilder Richardson, Duck and Company from 1915–1916, Rosemary carried out minesweeping and anti submarine operations during the First World War. She was used for fishery protection duties during the 1930s, and served through the Second World War, finally being sold for scrap in 1947.
HMS Alyssum was an Arabis-class minesweeping sloop of the British Royal Navy which served during the First World War. Alyssum was built in 1915 by Earle's Shipbuilding, and was used for minesweeping, escort and patrol duties in the North and Irish Seas. The sloop sank after hitting a German mine on 18 March 1917.
Royal Navy 
