 In response to developments in the Baltic in 1801 that threatened to deprive Britain of much @-@ needed naval supplies , Agamemnon was sent as part of a fleet under Admiral Sir Hyde Parker and Vice @-@ Admiral Lord Nelson to attack the Danish at Copenhagen . On 2 April , Agamemnon was part of Nelson 's division that fought the Battle of Copenhagen . Agamemnon was positioned second in the line after HMS Edgar , and after passing down the Outer Channel , she grounded whilst attempting to round the southern tip of the Middle Ground shoal . While the battle raged around her Agamemnon , along with Bellona and Russell , both of which had also run aground , flew signals of distress . The three stranded ships were eventually pulled off the Middle Ground in the night of 3 April . 
