This is because Adam Duncan (1 July 1731 - 4 August 1804), defeated the Dutch fleet off there on 11 October 1797 in the Battle of Camperdown.
The title was awarded in recognition of his services at the Battle of Camperdown where he was second in command.
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The Battle of Camperdown was an important naval action of the French Revolutionary Wars, fought off Camperduin on the North Holland coast on 11 October 1797 between a British fleet under Admiral Adam Duncan and a Dutch fleet under Vice-Admiral Jan de Winter.
In 1790 he took command of HMS Sheerness and in 1796 became flag captain of HMS Venerable under Admiral Adam Duncan and was heavily engaged at the Battle of Camperdown the following year.
Sir Richard Onslow, 1st Baronet (1741–1817), British naval leader distinguished at the Battle of Camperdown