American Flower-class corvette

Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.

The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is consequently known as the Senior Service.

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.

A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloop-of-war.

The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter-blockade. The campaign peaked from mid-1940 through to the end of 1943.

Lend-Lease, formally the Lend-Lease Act and introduced as An Act to Promote the Defense of the United States, was a policy under which the United States supplied the United Kingdom, the Soviet Union, France, China, and other Allied nations with food, oil, and materiel between 1941 and 1945. The aid was given for free on the basis that such help was essential for the defense of the United States.

The Oerlikon 20 mm cannon is a series of autocannons, based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used today.

A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive hydraulic shock. Most depth charges use high explosive charges and a fuze set to detonate the charge, typically at a specific depth. Depth charges can be dropped by ships, patrol aircraft, and helicopters.

The Hedgehog was a forward-throwing anti-submarine weapon that was used primarily during the Second World War. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat. It was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges.

The City of Sunderland is a metropolitan borough with city status in the metropolitan county of Tyne and Wear, North East England. It is named after its largest settlement, Sunderland, spanning a far larger area, including nearby towns including Washington, Hetton-le-Hole and Houghton-le-Spring, as well as the surrounding suburban villages. The district also forms a large majority of Wearside which includes Chester-le-Street in County Durham.

HMS Hibiscus 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 Spry, one of the Temptress-class gunboats. With the end of hostilities she was returned to the Royal Navy and sold into mercantile service.

Belfast is the capital and largest city of Northern Ireland, standing on the banks of the River Lagan on the east coast. It is the 12th-largest city in the United Kingdom and the second-largest in Ireland. It had a population of 345,418 in 2021.

HMS Periwinkle 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 Restless, one of the Temptress-class gunboats. With the end of hostilities she was returned to the Royal Navy and sold into mercantile service.

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.

Cook, Welton & Gemmell was a shipbuilder based in Hull and Beverley, East Riding of Yorkshire. England. They built trawlers and other small ships.

Collingwood is a town in Simcoe County, Ontario, Canada. It is situated on Nottawasaga Bay at the southern point of Georgian Bay. Collingwood is well known as a tourist destination, for its skiing in the winter, and limestone caves along the Niagara Escarpment in the summer.

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.

Kingston is a city in Ontario, Canada. It is located on the north-eastern end of Lake Ontario, at the beginning of the St. Lawrence River and at the mouth of the Cataraqui River. The city is midway between Toronto, Ontario and Montreal, Quebec. Kingston is also located nearby the Thousand Islands, a tourist region to the east, and the Prince Edward County tourist region to the west. Kingston is nicknamed the "Limestone City" because of the many heritage buildings constructed using local limestone.

Midland is a town located on Georgian Bay in Simcoe County, Ontario, Canada. It is part of the Huronia/Wendat region of Central Ontario.

USS Might (PG-94) was laid down as Canadian corvette CN-312 by Morton Engineering and Drydock Co., Ltd., Quebec, Canada, on 28 November 1941 and launched as HMS Musk on 15 July 1942. The ship was transferred to the United States Navy on 20 July 1942, renamed Might on 14 August 1942, and commissioned at Quebec on 22 December 1942.

USS Prudent (PG–96), originally ordered as HMS Privet, was an Action-class patrol gunboat in the United States Navy.