HDMS Narhvalen (S320) was the lead ship of her class of submarine for the Royal Danish Navy. She was built to the German Type 205 design at the naval dockyard in Copenhagen where she was laid down on 16 February 1965. She was launched on 10 September 1968, and was commissioned into the Royal Danish Navy on 27 February 1970. In 1994, Narhvalen and sister ship Nordkaperen were modified to bring their technical performance more in line with the Royal Danish Navy's newer Tumleren class. Narhvalen was decommissioned on 16 October 2003.
The Danish ironclad Dannebrog was an armored frigate of the Royal Danish Navy that was originally built as an 80-gun ship-of-the-line by Andreas Schifter was launched in 1850 but was reconstructed into a steam-powered ironclad in the early 1860s. She had an uneventful career before the ship was stricken from the navy list in 1875. The ship was converted into an accommodation ship that same year and served until she became a target ship in 1896. Dannebrog was broken up in 1897.
HMS Annan was a River-class frigate built for the Royal Navy but was transferred to the Royal Canadian Navy before commissioning. She served with the Royal Canadian Navy during the Second World War and saw action primarily as a convoy escort in the Battle of the Atlantic. She was returned to United Kingdom following the war and quickly sold to Denmark, who renamed the vessel Niels Ebbesen. She was primarily used as a training vessel until 1963 when she was broken up in Odense. She was named for the River Annan in Scotland in UK and Canadian service and Niels Ebbesen in Danish service.
Royal Danish Navy 
DFDS Seaways 
Rederi Ab Sally 
People's Liberation Army Navy 
Soviet Navy