HMS Buttercup (K193)

The Royal Norwegian Navy is the branch of the Norwegian Armed Forces responsible for naval operations of Norway. As of 2008, the Royal Norwegian Navy consists of approximately 3,700 personnel and 70 vessels, including 4 heavy frigates, 6 submarines, 14 patrol boats, 4 minesweepers, 4 minehunters, 1 mine detection vessel, 4 support vessels and 2 training vessels. It also includes the Coast Guard.

The Castle-class corvette was an ocean going convoy escort developed by the United Kingdom during the Second World War. It was the follow-on to the Flower-class corvette, and designed to be built in shipyards that were producing the Flowers. The Castle-class was a general improvement over the smaller Flowers which were designed for coastal rather than open ocean use.

HMS Shrewsbury Castle was one of 44 Castle-class corvette built for the Royal Navy during the Second World War. She was named after Shrewsbury Castle in Shrewsbury. Completed in 1944, she was loaned to the Royal Norwegian Navy as a convoy escort during the war, renamed HNoMS Tunsberg Castle and was sunk by a mine in December 1944.

Tromsø is a municipality in Troms og Finnmark county, Norway. The administrative centre of the municipality is the city of Tromsø.

Svalbard, also known as Spitsbergen, or Spitzbergen, is a Norwegian archipelago in the Arctic Ocean. North of mainland Europe, it lies about midway between the northern coast of Norway and the North Pole. The islands of the group range from 74° to 81° north latitude, and from 10° to 35° east longitude. The largest island is Spitsbergen, followed in size by Nordaustlandet and Edgeøyacode: nor promoted to code: no . The largest settlement is Longyearbyen.

Bear Island is the southernmost island of the Norwegian Svalbard archipelago. The island is located in the western part of the Barents Sea, approximately halfway between Spitsbergen and the North Cape. Bear Island was discovered by Dutch explorers Willem Barentsz and Jacob van Heemskerck on 10 June 1596. It was named after a polar bear that was seen swimming nearby. The island was considered terra nullius until the Spitsbergen Treaty of 1920 placed it under Norwegian sovereignty.

Spitsbergen is the largest and the only permanently populated island of the Svalbard archipelago in northern Norway.

The Consolidated PBY Catalina is a flying boat and amphibious aircraft that was produced in the 1930s and 1940s. In Canadian service it was known as the Canso. It was one of the most widely used seaplanes of World War II. Catalinas served with every branch of the United States Armed Forces and in the air forces and navies of many other nations. The last military PBYs served until the 1980s. As of 2021, 86 years after its first flight, the aircraft continues to fly as a waterbomber in aerial firefighting operations in some parts of the world. None remain in military service.

Ships of the Royal Navy is a naval history reference work by J. J. Colledge (1908–1997); it provides brief entries on all recorded ships in commission in the Royal Navy from the 15th century, giving location of constructions, date of launch, tonnage, specification and fate.

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 Free French Naval Forces were the naval arm of the Free French Forces during the Second World War. They were commanded by Admiral Émile Muselier.

Aconit was one of the nine Flower-class corvettes lent by the Royal Navy to the Free French Naval Forces. During World War II, she escorted 116 convoys, spending 728 days at sea. She was awarded the Croix de la Libération and the Croix de Guerre 1939–1945, and was cited by the British Admiralty. Following the war she was used as whaling ship for three different companies from 1947 to 1964.

Alysse was one of the nine Flower-class corvettes lent by the Royal Navy to the Free French Naval Forces.

La Bastiaise was a Flower-class corvette of the French Navy. The ship was built by the British shipyard Smiths Dock in their Middlesbrough shipyard, and was completed in June 1940, just before the French Armistice with Germany. She was sunk by a mine on 22 June 1940 during sea trials.

The Royal Canadian Navy is the naval force of Canada. The RCN is one of three environmental commands within the Canadian Armed Forces. As of 2021, the RCN operates 12 frigates, four attack submarines, 12 coastal defence vessels, eight patrol class training vessels, two offshore patrol vessels, and several auxiliary vessels. The RCN consists of 8,570 Regular Force and 4,111 Primary Reserve sailors, supported by 3,800 civilians. Vice-Admiral Angus Topshee is the current commander of the Royal Canadian Navy and chief of the Naval Staff.

HMCS Agassiz was a Flower-class corvette of the Royal Canadian Navy. Named after the community of Agassiz, British Columbia, the ship was constructed by Burrard Dry Dock Co. Ltd. in North Vancouver, British Columbia and was launched on 15 August 1940. The corvette was commissioned on 23 January 1941 in Vancouver, British Columbia. The Flower class were initially designed for coastal service during the Second World War, but due to the demands of the Battle of the Atlantic, Agassiz was used primarily as an ocean escort for convoys crossing the Atlantic Ocean in engagements with German submarines. Following the war, the corvette was sold for scrap.

HMCS Baddeck was a Flower-class corvette that served with the Royal Canadian Navy during the Second World War. She served in several theatres of operations during the war. After the war the ship was retired but the ship's name, pennant number and badge continue to be used by the K147 Baddeck Royal Canadian Sea Cadets Corps.