HMS Duncan was the fifth RN ship named after Admiral Adam Duncan. She was a of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 that served in the Cod Wars.

She was involved in the First Cod War between United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 and Iceland

Iceland

Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

 over fishing rights, intervening between the Icelandic coastguard and British trawlers.

She was an escort to HMY Britannia

HMY Britannia

Her Majesty's Yacht Britannia is the former Royal Yacht of the British monarch, Queen Elizabeth II. She was the 83rd such vessel since the restoration of King Charles II in 1660. She is the second Royal yacht to bear the name, the first being the famous racing cutter built for The Prince of Wales...

 in August 1960. In 1964 she fired the salute at the opening of the new Forth Road Bridge

Forth Road Bridge

The Forth Road Bridge is a suspension bridge in east central Scotland. The bridge, opened in 1964, spans the Firth of Forth, connecting the capital city Edinburgh, at South Queensferry, to Fife, at North Queensferry...

. She also visited Nantes

Nantes

Nantes is a city in western France, located on the Loire River, from the Atlantic coast. The city is the 6th largest in France, while its metropolitan area ranks 8th with over 800,000 inhabitants....

 in 1961 and Copenhagen

Copenhagen

Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

 in 1965.

She was given the Freedom of the city of Hull

Kingston upon Hull

Kingston upon Hull , usually referred to as Hull, is a city and unitary authority area in the ceremonial county of the East Riding of Yorkshire, England. It stands on the River Hull at its junction with the Humber estuary, 25 miles inland from the North Sea. Hull has a resident population of...

for the part she played in the Cod Wars.

During the early 1980s, HMS Duncan served alongside as Harbour Training Ship at Rosyth Dockyard for the Marine Engineering Artificer Apprentices from the shore base HMS Caledonia.