HMS Ambuscade was an Acasta-class destroyer of the Royal Navy and was launched in 1913. She served throughout the First World War, forming part of the Grand Fleet and taking part at the Battle of Jutland, serving in the Dover Patrol and spending the latter part of the war as a convoy escort. She was sold for scrapping in 1921.
HMS G9 was a G-class submarine, one of eight Royal Navy submarines known to have been lost to friendly fire in World War I.
HMS Cockatrice was an Acasta-class destroyer of the British Royal Navy. She was built by Hawthorn Leslie and Company, launching in 1912 and served throughout the First World War. She was sold for scrap in 1921.
HMS Partridge was a Royal Navy Admiralty M-class destroyer constructed and then operational in the First World War, later being sunk by enemy action in 1917. The destroyer was the sixth Royal Navy vessel to carry the name HMS Partridge.
HMS Rob Roy was a Royal Navy R-class destroyer constructed and then operational in the First World War. The ship served in the Grand Fleet as part of the Fifteenth Destroyer Flotilla.
HMS Christopher was an Acasta-class destroyer of the British Royal Navy. She was built by Hawthorn Leslie in 1911–1912. She served throughout the First World War, forming part of the Grand Fleet until 1916 and taking part in the Battle of Jutland. Later in the war she served in the English Channel to protect merchant shipping against attacks by German U-boats. Christopher was sold for scrap in May 1921.
HMS Rapid was a destroyer of the M class that served with the Royal Navy during First World War. Launched by Thornycroft in 1916, the vessel was the one of two similar ships ordered as part of the Fifth War Construction Programme. They differed from the remainder of the M class in having more powerful engines. The design was used as the basis for the subsequent five ships of the R-class also built by the yard. Rapid served in escort and patrol roles, principally providing defence from submarines as part of the Grand Fleet until it was disbanded at the end of the War. After the end of hostilities, the vessel served in minor roles, including briefly as part of the Admiralty Compass Department in 1921 and 1924, but was sold to be scrapped in 1927.
HMS Sarpedon was an R-class destroyer which served with the Royal Navy. The R class were a development of the preceding M-class, but differed in having geared turbines and other design changes. Launched in June 1916, the vessel escorted convoys that sailed between Scotland and Scandinavia in the First World War. After the war, the ship was allocated to local defence at Nore. However, in 1923, the Navy decided to retire many of the older vessels and Sarpedon was retired and was sold to be broken up on 23 June 1926.
HMS Seymour was a Parker-class flotilla leader of the British Royal Navy. She was built by Cammell Laird during the First World War, being launched on 31 August 1916 and completing on 30 November that year. Seymour served with the Grand Fleet for the rest of the war, which she survived. The ship was sold for scrap in January 1931.
HMS Restless was an R-class destroyer which served with the Royal Navy during World War I. Launched on 12 August 1916, the ship operated as part of the Grand Fleet, operating as part of a destroyer flotilla protecting convoys in the North Sea. After the War, the destroyer served in the Mediterranean Sea and was sold to be broken up on 23 November 1936.
HMS Rowena was an R-class destroyer which served with the Royal Navy during World War I. Launched on 1 July 1916, the ship operated as part of the Grand Fleet as part of a destroyer flotilla hunting for German vessels that were attacking convoys in the North Sea. Although there were many reported sightings, no submarines were sunk. After the conflict, the vessel was transferred to the Navy’s establishment at Portland to help in the development of anti-submarine warfare, which ultimately helped in the Battle of the Atlantic. Rowena did not, however, see the fruit of this labour. After twenty years of service, the destroyer was retired and sold to be broken up on 27 January 1937.
HMS Mounsey was a Yarrow M-class destroyer of the British Royal Navy. Built by the Scottish shipbuilder Yarrow in 1914–1915, Mounsey served in the Grand Fleet during the First World War, and took part in the Battle of Jutland. The following year she saw combat against German submarines, and in 1918 she helped rescue crew and passengers aboard the damaged troopship Otranto. She was sold for scrap in 1921.
HMS Pellew was a Admiralty M-class destroyer which served with the Royal Navy during the First World War. The M class were an improvement on the preceding L class, capable of higher speed. Launched on 18 April 1916, the vessel served with the Grand Fleet escorting convoys. The vessel was part of an unsuccessful attempt by the navy to trap the German submarines that had taken such a heavy toll on merchant shipping in December 1917. The action involved an eight-ship convoy consisting of four merchant vessels escorted by two armed trawlers and the sister ships Pellew and Partridge. Instead of submarines, four German destroyers attacked, sinking all but one member of the convoy and disappearing before the light cruisers which were to be the spring in the trap could arrive. Pellew, the sole survivor, took refuge in a Norwegian fjord. After the armistice that ended the war, the destroyer was placed in reserve and subsequently sold to be broken up on 9 May 1921.
HMS Pelican was a Admiralty M-class destroyer which served with the Royal Navy during the First World War. The M class were an improvement on the preceding L class, capable of higher speed. Launched on 18 March 1916, the vessel served with the Grand Fleet, taking part in significant actions on 19 August 1916 and 4 May 1917, as well as the fight between the British and German battlecruisers in the Battle of Jutland. The destroyer also undertook the other more general roles were typical of the type, including anti-submarine sweeps and escort duties for convoys. The destroyer had success driving away German submarines but did not sink any. After the end of the war, Pelican initially joined a Local Defence Flotilla but within a year had been placed in reserve and was subsequently sold to be broken up on 9 May 1921.
HMS Penn was a Repeat Admiralty M-class destroyer which served with the Royal Navy during the First World War. The M class were an improvement on the preceding L class, capable of higher speed. The ship was named after William Penn, the father of the founder of Pennsylvania. Launched on 8 April 1916, the vessel served with the Grand Fleet forming part of the screen for the dreadnought battleships of the 1st Battle Squadron and escorting the aircraft carrier Furious in battle. The destroyer participated in the Actions of 19 August 1916 and 16 October 1917, as well as forming part of the distant support during the Second Battle of Heligoland Bight. Penn was also instrumental in rescuing the survivors from the light cruiser Nottingham, sunk by a German submarine. After the Armistice that ended the war, the destroyer was placed in reserve and subsequently sold to be broken up on 9 May 1921.
HMS Orford was an Admiralty M-class destroyer which served in the Royal Navy during the First World War. The M class were an improvement on the previous L-class, capable of higher speed. The vessel was launched on 19 April 1916 and joined the Grand Fleet. Orford spent much of the war undertaking anti-submarine warfare patrols and escorting convoys across the Atlantic Ocean. Although based at Scapa Flow, the destroyer ranged far, often operating off the coast of Cornwall and even having a temporary transfer to Buncrana in Ireland in 1917. In 1918, the destroyer took part in one of the final sorties of the Grand Fleet, but saw no action. After the Armistice that marked the end of the First World War, Orford was placed in reserve, decommissioned and, on 31 October 1921, sold to be broken up.
HMS Octavia was an Admiralty M-class destroyer which served in the Royal Navy during the First World War. The M class were an improvement on the previous L-class, capable of higher speed. The vessel was launched on 21 June 1916 and joined the Grand Fleet. Octavia joined the Thirteenth Destroyer Flotilla, which, in 1917, participated in a large anti-submarine warfare operation in the North Sea. The sortie led to three German submarines being sunk, although Octavia was not directly involved in these attacks. In 1918, the flotilla was involved in one of the final sorties of the Grand Fleet, but again the destroyer saw no action at the time. After the Armistice that marked the end of the First World War, Octavia was placed in reserve, decommissioned and, on 5 November 1921, sold to be broken up.
HMS Opportune was an Admiralty M-class destroyer which served in the Royal Navy during the First World War. The M class were an improvement on the previous L-class, capable of higher speed. The vessel was launched on 20 November 1915 and joined the Grand Fleet. Opportune spent much of the war involved in anti-submarine warfare. The ship took part in large patrols to seek out submarines which involved entire flotillas and also acted as an escort for convoys. After the Armistice that marked the end of the First World War, the destroyer was transferred to Portsmouth and placed in reserve. After a brief spell as a remote controlled target to test how warships responded to attacks by aircraft, Opportune was decommissioned and, on 7 December 1923, sold to be broken up.
HMS Oberon was a Repeat Admiralty M-class destroyer which served in the Royal Navy during the First World War. The M class were an improvement on the previous L-class, capable of higher speed. The vessel was launched in 1916 and joined the Grand Fleet. Oberon joined the Thirteenth Destroyer Flotilla which, in 1917, participated in a large anti-submarine warfare operation in the North Sea. The sortie led to three German submarines being sunk, although Oberon was not directly involved in these attacks. In 1918, the flotilla was involved in one of the final sorties of the Grand Fleet, but again the destroyer saw no action at the time. After the Armistice that marked the end of the First World War, Oberon was placed in reserve, decommissioned and, in 1921, sold to be broken up.
HMS Onslaught was a Admiralty M-class destroyer which served with the Royal Navy during the First World War. The M class were an improvement on the previous L-class, capable of higher speed. The vessel, launched in 1915, joined the Twelfth Destroyer Flotilla under the flotilla leader Faulknor. The ship saw action during the Battle of Jutland in May 1916, jointly sinking the German torpedo boat SMS V48 and launching the torpedo that sank the pre-dreadnought battleship Pommern, the only German battleship to be lost in the battle. Subsequently, the destroyer acted as an escort to other naval ships during the Action of 19 August 1916 and took part in anti-submarine operations. At the end of the war, Onslaught was withdrawn from service and, in 1921, sold to be broken up.
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