HMS Mackay was an Admiralty type, sometimes known as the Scott class, flotilla leader of the British Royal Navy. Mackay was built by Cammell Laird during the First World War, but was completed too late for service then, commissioning in 1919.

Prinz Eugen was an Admiral Hipper-class heavy cruiser, the third of a class of five vessels. She served with Nazi Germany's Kriegsmarine during World War II. The ship was laid down in April 1936, launched in August 1938, and entered service after the outbreak of war, in August 1940. She was named after Prince Eugene of Savoy, a distinguished 18th-century general in the service of the Holy Roman Empire. She was armed with a main battery of eight 20.3 cm (8 in) guns and, although nominally under the 10,000-long-ton (10,160 t) limit set by the Anglo-German Naval Agreement, actually displaced over 16,000 long tons (16,257 t).