The Battle of Copenhagen (Danish: slaget på Reden) was an engagement which saw a British fleet under the command of Admiral Sir Hyde Parker fight and strategically defeat a Danish-Norwegian fleet anchored just off Copenhagen on 2 April 1801. Vice-Admiral Horatio Nelson led the main attack. He famously is reputed to have disobeyed Sir Hyde Parker's order to withdraw by holding the telescope to his blind eye to look at the signals from Parker. But Parker's signals had given him permission to withdraw at his discretion, and Nelson declined. His action in proceeding resulted in the destruction of many of the Dano-Norwegian ships before a truce was agreed. Copenhagen is often considered to be Nelson's hardest-fought battle.