Battle of Copenhagen The Battle of Copenhagen ( ) 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 . Background . The battle was the result of multiple failures of diplomacy in the latter half of the 18th century . At the beginning of 1801 , during the French Revolutionary Wars , Britain ' s principal advantage over France was its naval superiority . The Royal Navy searched neutral ships trading with French ports , seizing their cargoes if they were deemed to be trading with France . The eccentric Russian Tsar Paul , after having been a British ally , arranged a League of Armed Neutrality comprising Denmark - Norway , Sweden , Prussia , and Russia , to enforce free trade with France . The British viewed the League to be very much in the French interest and a serious threat . The League was hostile to the British blockade , and its existence threatened the supply of timber and naval stores from Scandinavia . In early 1801 , the British government assembled a fleet at Great Yarmouth , with the goal of breaking up the League . The British needed to act before the Baltic Sea thawed and released the Russian fleet from its bases at Kronstadt and Reval ( now Tallinn ) . If the Russian fleet joined with the Swedish and Dano - Norwegian fleets , the combined fleets would form a formidable force of up to 123 ships - of - the - line . The British fleet was under the command of Admiral Sir Hyde Parker , with Vice - Admiral Lord Nelson ( then in poor favour owing to his activities with the Hamiltons ) as second - in - command . Parker , aged 61 , had just married an eighteen - year - old and was reluctant to leave port in Great Yarmouth . Prompted by a letter from Nelson to Captain Thomas Troubridge , a friend and a Lord Commissioner of the Admiralty , a private note from St Vincent , the First Lord of the Admiralty , caused the fleet to sail from Yarmouth on 12 March . Orders were sent to Parker to go to Copenhagen and detach Denmark from the League by ' amicable arrangement or by actual hostilities ' , to be followed by ' an immediate and vigorous attack ' on the Russians at Reval and then Kronstadt . The British fleet reached the Skaw ( Danish : " Skagen " ) on 19 March , where they met a British diplomat , Nicholas Vansittart , who told them that the Danes had rejected an ultimatum . Although the Admiralty had instructed Parker to frustrate the League , by force if necessary , he was a cautious person and moved slowly . He wanted to blockade the Baltic despite the danger of the combination of fleets ; Nelson wanted to ignore Denmark and Sweden , who were both reluctant partners in the alliance , and instead sail to the Baltic to fight the Russians . In the end Nelson was able to persuade Sir Hyde to attack the Danish fleet currently concentrated off Copenhagen . Promised naval support for the Danes from Karlskrona , in Sweden , did not arrive perhaps because of adverse winds . The Prussians had only minimal naval forces and also could not assist . On 30 March , the British force passed through the narrows between Denmark and Sweden , sailing close to the Swedish coast to put themselves as far from the Danish guns as possible ; fortunately for the British , the Swedish batteries remained silent . Attacking the Danish fleet would have been difficult as Parker ' s delay in sailing had allowed the Danes to prepare their positions well . Most of the Danish ships were not fitted for sea but were moored along the shore with old ships ( hulks ) , no longer fit for service at sea , but still powerfully armed , as a line of floating batteries off the eastern coast of the island of Amager , in front of the city in the King ' s Channel . The northern end of the line terminated at the Tre Kroner ( " Three Crowns " — Denmark , Norway , and Sweden , referring to the Kalmar Union ) forts armed with 68 guns ( equal to twice the broadside of a ship - of - the - line ) . North of the fort , in the entrance to Copenhagen harbour , were two ships - of - the - line , a large frigate , and two brigs , all rigged for sea , and two more hulks . Batteries covered the water between the Danish line and the shore , and further out to sea a large shoal , the Middle Ground , constricted the channel . The British had no reliable charts or pilots , so Captain Thomas Hardy spent most of the night of 31 March taking soundings in the channel up to the Danish line . Even so , the British ships were not able to locate the deepest part of the channel properly and so kept too far to seaward . Battle . Parker had given Nelson the twelve ships - of - the line with the shallowest drafts and all the smaller ships in the fleet , while he himself stayed with the remainder of the fleet to the north - east of the battle , screening Nelson from external interference and moving towards Copenhagen to engage the northern defences . On 30 March Nelson , and his second - in - command , Rear Admiral Thomas Graves , accompanied by Captain Domett and the commanding officer of the troops , sailed in the hired lugger " Lark " to reconnoiter the Danish defenses at Copenhagen . They found the defenses to be strong and so spent the evening discussing the plan . Fixed batteries had a significant advantage over ship borne cannon owing to their greater stability and larger guns , and the Danes could reinforce their ships during the battle ( including the replacement of a captain at one point ) . On the other hand , their ships were a motley collection , many of them small , and if engaged by the whole of Nelson ' s force , outgunned . Nelson ' s plan was for the British ships to approach the weaker , southern end of the Danish defences in a line parallel to the Danish one . As the foremost ship drew alongside a Danish ship , it would anchor and engage that ship . The remainder of the line would pass outside until the next ship drew alongside the next Danish ship , and so on . The frigate " Desiree " , together with small gun - brigs , would rake the Danish line from the south , and a force of frigates , commanded by Captain Edward Riou of , would attack the northern end of the line . Troops would assault the Tre Kroner fortress once the fleet had subdued the Danish line of ships . Bomb vessels would sit outside the British line and bombard the Danes by firing over it . Should the British be unable to subdue the stronger , northern defences , the destruction of the southern ships would be enough to allow the bomb vessels to approach within range of the city and force negotiations to prevent the bombardment of the city . With a southerly wind on the 1 April , Nelson picked his way through the shoals . However , " Agamemnon " ran aground before entering the channel , and took no part in the battle . Then " Russell " and " Bellona " ran aground on the Middle Ground , severely restricting their role in the battle . The loss of the three vessels required hurried changes in the line and weakened the force ' s northern end . The Danish batteries started firing at 10 : 05am , the first half of the British fleet were engaged for about half an hour , and the battle was generally over by 11 : 30am Once the British line was in place there was very little manœuvring . The British ships anchored by the stern about a cable from the line of Danish ships and batteries , which was relatively long range , and the two exchanged broadsides until a ship ceased firing . The British encountered heavy resistance , partly because they had not spotted the low - lying floating batteries , and partly because of the courage with which the Danes fought . The northern Danish ships , which were rigged and manned , did not enter the battle but remained on station as reserve units , even though the wind direction forced Parker ' s squadron to approach only slowly . At 1 pm , the battle was still in full swing . " Prøvesteenen " s heavier fire would have destroyed " Isis " if " Desirée " , assisted by " Polyphemus " , had not raked the Danish vessel . " Monarch " suffered badly from the combined fires of " Holsteen " and " Sjælland " . Parker would have been able to see little of the battle owing to gun smoke , though he could see the signals on the three grounded British ships , with " Bellona " and " Russell " flying signals of distress and " Agamemnon " a signal of inability to proceed . Thinking that Nelson might have fought to a stand - still but be unable to retreat without orders ( the Articles of War demanded that all ranks do their utmost against the enemy in battle ) , at 1 : 30pm Parker told his flag captain , " I will make the signal of recall for Nelson ' s sake . If he is in condition to continue the action , he will disregard it ; if he is not , it will be an excuse for his retreat and no blame can be imputed to him . " Nelson ordered that the signal be acknowledged , but not repeated . He turned to his flag Captain , Foley , and said " You know , Foley , I only have one eye — I have the right to be blind sometimes , " and then , holding his telescope to his blind eye , said " I really do not see the signal ! " Rear Admiral Graves , repeated the signal , but in a place invisible to most other ships while keeping Nelson ' s ' close action ' signal at his masthead . Of Nelson ' s captains , only Riou , who could not see Nelson ' s flagship " Elephant " , followed Parker ' s signal . Riou withdrew his force , which was then attacking the Tre Kroner fortress , exposing himself to heavy fire that killed him . It was at this time that the battle swung decisively to the British , as their superior gunnery took effect . The guns of the dozen southernmost Danish ships had started to fall silent owing to the damage they had sustained , and the fighting moved northward . According to British eyewitness accounts , much of the Danish line had fallen silent by 2pm . The cessation of firing left the way open for the British bomb vessels to approach Copenhagen . In addition , the reinforcements of the ships from the shore batteries were causing the latter to become ineffective . " Nyborg " tried to leave the line with " Aggershuus " in tow , but both sank . The most northerly ship , the frigate " Hjælperen " , successfully withdrew . The Danish commander , Olfert Fischer , moved from " Dannebrog " at 11 : 30am , when it caught fire , to " Holsteen " . When " Indfødsretten " , immediately north of " Holsteen " , struck its colours at about 2 : 30pm , he moved on to the Tre Kroner fortress . There he engaged three of Parker ' s ships , which had lost their manoeuvrability after being badly damaged and had drifted within range . " Indfødsretten " resumed firing after Captain Schrodersee was ferried to it and took command of the ship . Perhaps because of inexperienced crews , several Danish ships fired on British boats sent out to them after their officers had signalled their surrender . Nelson said that he " must either send on shore and stop this irregular proceeding , or send in our fire ships and burn them " and went to his cabin to write a note to the Danes . He sent it with a Danish - speaking officer , Captain Sir Frederick Thesiger , under a flag of truce to the Danish - Norwegian regent , Crown Prince Frederik , who had been watching the battle from the ramparts of the Citadel . The note read : Some British and Danish officers thought the offer of a truce a skillful " ruse - de - guerre " , and some historians have suggested that the battle would have been lost if it had not been adopted , as many of the British ships , like many of the Danish ships in the battle , could not carry on fighting much longer . Furthermore , neither side had deployed the ships which they both held in reserve , of which the Danish reserve was arguably the larger , and the truce effectually prevented this deployment at a moment where the British fleet was exposed . Though the British had lost no ships , most were severely damaged and three ships of the line had lost all their manoeuvrability and had at the time of the truce drifted within the range of Tre Kroner ' s heavy guns which , up until then , like the other fortresses , had been out of range of the British ships . All action ceased when Crown Prince Frederick sent his Adjutant General , a Danish member of parliament , Hans Lindholm , asking for the reason for Nelson ' s letter . He was asked to put it in writing , which he did , in English , while making the joke : " If your guns are not better pointed than your pens , then you will make little impression on Copenhagen . " In reply , Nelson wrote a note : which was sent back to the Crown Prince , and then referred Lindholm to Parker on the " London " . Following him there at 4 pm , a twenty - four hour ceasefire was agreed . At 4 : 30pm , the Danish flagship " Dannebrog " exploded , killing 250 men . By the end of the afternoon , three more badly - damaged British ships ran aground , including " Elephant " . The Danish - Norwegian ships had been partly manned by volunteers , many having little or no naval experience , and as they were not all listed after the battle , it is uncertain what the exact Danish - Norwegian losses were , but estimates vary between 1 , 135 to 2 , 215 captured , killed or wounded . The official report by Olfert Fischer estimated the Danish - Norwegian casualties to be between 1 , 600 and 1 , 800 captured , killed or wounded . According to the official returns recorded by each British ship , and repeated in dispatches from Nelson and forwarded by Parker to the Admiralty , British casualties were 264 killed and 689 wounded . Of the Danish ships engaged in the battle , two sank , one exploded , and twelve were captured . The British could not spare men for manning prizes as they feared that further battles would come up so they burned eleven ships , and only one , " Holsteen " , returned to England with the wounded under surgeon William Fergusson , where the Royal Navy took her over and renamed her HMS " Nassau " . Aftermath . The next day , 2 April , Nelson landed in Copenhagen to open negotiations . Colonel Stewart reported that " the population showed an admixture of admiration , curiosity and displeasure " . In a two - hour meeting with the Crown Prince ( who spoke English ) , Nelson was able to secure an indefinite armistice . He then tried to convince first Fischer ( whom he had known in the West Indies ) , and then the Prince , of British protection against the Russians . Negotiations continued by letter and on the 8th April Nelson returned in person with a formal agreement . The one sticking point out of the seven articles was a sixteen - week armistice to allow action against the Russians . At this point Stewart claims that one of the Danes turned to another and said in French that disagreement might lead to a renewal of hostilities . " Renew hostilities ! " responded Nelson , and turning to his interpreter said " Tell him that we are ready in a moment ; ready to bombard this very night ! " Hurried apologies followed ( the British fleet now occupied positions that would allow the bombardment of Copenhagen ) and agreement was reached and signed the next day . The armistice was reduced to fourteen weeks , but during it Armed Neutrality would be suspended and the British were to have free access to Copenhagen . Danish prisoners were also paroled . In the final hour of negotiations , the Danes found out ( but not the British ) that Tsar Paul had been assassinated . This made the end of the League of Armed Neutrality very likely and freed the Danes from the fear of Russian action against them , allowing them to easily come to agreement . The final peace agreement was then signed on 23 October 1801 . On the 12th April , Parker sailed to Karlskrona and on the British approach , the Swedish fleet returned to the port where Parker attempted to persuade them to also leave the League . Parker refused to sail into the eastern Baltic and instead returned to Copenhagen , where he found that news of his lack of vigour had reached London . On the 5 May he was recalled and ordered to hand his command over to Nelson . Nelson sailed eastwards again and leaving six ships - of - the - line at Karlskrona , he arrived at Reval on 14 May to find that the ice had melted and the Russian fleet had departed for Kronstadt . He also found out that negotiations for ending the Armed Neutrality had started and so withdrew on 17 May . As a result of the battle , Lord Nelson was created Viscount Nelson of the Nile . This was not to be the end of the Danish - Norwegian conflict with the British . In 1807 similar circumstances led to another British attack , in the Second Battle of Copenhagen . " Polyphemus " 64 ( Captain John Lawford ) < br > Ships involved . United Kingdom . " Isis " 50 ( Captain James Walker ) < br > " Edgar " 74 ( Captain George Murray ) < br > " Ardent " 64 ( Captain Thomas Bertie ) < br > " Glatton " 54 / 56 ( Captain William Bligh ) < br > " Elephant " 74 ( flag of Vice - Adm . Lord Nelson , Captain Thomas Foley ) < br > " Ganges " 74 ( Captain Thomas Francis Fremantle ) < br > " Monarch " 74 ( Captain James Robert Mosse ) < br > " Defiance " 74 ( 2nd flag of Rear - Adm . Thomas Graves , Captain Richard Retalick ) < br > " Russell " 74 ( Captain William Cuming ) < br > " Bellona " 74 ( Captain Thomas Boulden Thompson ) < br > " Agamemnon " 64 ( Captain Robert Devereux Fancourt ) < br > " Désirée " 36 ( Captain Henry Inman ) < br > " Amazon " 38 ( Captain Edward Riou ) < br > " Blanche " 36 ( Captain Graham Eden Hamond ) < br > " Alcmène " 32 ( Captain Samuel Sutton ) < br > " Jamaica " 24 ( Captain Jonas Rose ) < br > " Arrow " ( ship - sloop , Captain William Bolton ) < br > " Dart " ( ship - sloop , Captain John Ferris Devonshire ) < br > " Cruizer " ( brig - sloop , Cmdr . James Brisbane ) < br > " Harpy " ( brig - sloop , Cmdr . William Birchall ) < br > " Discovery " ( bomb , Cmdr . John Conn ) < br > " Explosion " ( bomb , Cmdr . John Henry Martin ) < br > " Hecla " ( bomb , Cmdr . Richard Hatherhill ) < br > " Sulphur " ( bomb , Cmdr . Hender Whitter ) < br > " Terror " ( bomb , Cmdr . Samuel Campbell Rowley ) < br > " Volcano " ( bomb , Cmdr . James Watson ) < br > " Zebra " ( bomb , Cmdr . Edward Sneyd Clay ) < br > " Otter " ( fireship , Cmdr . George M ' Kinley ) < br > " Zephyr " ( fireship , Cmdr . Clotworthy Upton ) " London " 98 ( flag of Admiral Sir Hyde Parker , with 1st Captain William Domett and 2nd Captain Robert Walker Otway ) < br > " St George " 98 ( Captain Thomas Masterman Hardy ) < br > " Warrior " 74 Captain Charles Tyler ) < br > " Defence " 74 ( Captain Henry Paulet ) < br > " Saturn " 74 ( Captain Robert Lambert ) < br > " Ramillies " 74 ( Captain James William Taylor Dixon ) < br > " Raisonnable " 64 ( Captain John Dilkes ) < br > " Veteran " 64 ( Captain Archibald Collingwood Dickson ) Denmark - Norway . Fischer ' s division in the King ' s Deep ( order south – north . Only " Siælland " and " Holsteen " were in good condition , also note the age of the ships . ) < br > " Prøvesteenen " 52 / 56 ( 3 - decker battleship , rebuilt as a two - deck " defensionsskib " ( " Defense - ship " ) , Kaptain L . F . Lassen < br > " Wagrien " 48 / 52 ( 2 - decker ship of the line , 1775 ) , Kaptajn F . C . Risbrich < br > " Rendsborg " 20 ( pram ) , Kaptajnløjtnant C . T . Egede < br > " Nyborg " 20 ( pram ) Kaptajnløjtnant C . A . Rothe < br > " Jylland " 48 / 54 ( Originally 70 gun 2 - decker ship of the line , 1760 ) , Kaptajn E . O . Branth < br > " Sværdfisken " 18 / 20 ( radeau , 1764 ) , Sekondløjtnant S . S . Sommerfeldt < br > " Kronborg " 22 ( frigate , 1779 ) , Premierløjtnant J . E . Hauch < br > " Hajen " 18 / 20 ( radeau , 1793 ) , Sekondløjtnant J . N . Müller < br > " Dannebrog " 60 ( flag , 2 - decker ship of the line , 1772 ) , Kaptajn F . A . Bruun < br > " Elven " 10 ( frigate , 1800 ) , Kaptajnløjtnant H . Holsten < br > " Flådebatteri No . 1 " 20 ( Grenier ' s float / Floating Battery No . 1 1787 ) , Søløjtnant Peter Willemoes < br > " Aggershus " 20 ( " Defensionsfartøj " " Defence vessel " ) 1786 ) , Premierløjtnant T . Fassing < br > " Siælland " 74 ( 2 - decker ship of the line , 1776 ) , Kaptajn F . C . L . Harboe < br > " Charlotte Amalia " 26 ( Old Danish East Indiaman ) , Kaptajn H . H . Kofoed < br > " Søehesten " 18 ( radeau 1795 ) , Premierløjtnant B . U . Middelboe < br > " Holsteen " 60 ( ship of the line , 1772 ) , Kaptajn J . Arenfelt < br > " Indfødsretten " 64 ( 2 - decker ship of the line , 1778 ) , Kaptajn A . de Turah < br > " Hielperen " 16 ( frigate ) , Premierløjtnant P . C . Lilienskiold Fischer ' s division in the Inner Run " Elephanten " 70 < br > " Mars " 74 < br > " Sarpen " 18 - gun brig < br > " Nidelven " 18 - gun brig < br > " Danmark " 74 < br > " Trekroner " 74 ( not to be confused with Tre Kroner fortress ) Fortifications Sea battery TreKroner 68 guns . Sea Battery Lynetten ? guns . Land battery Sixtus ? guns . Land battery Quintus ? guns . Fortress Kastellet ? guns . Steen Bille ' s division < br > " These ships did not see action , the list is incomplete . Around 14 modern ships of the line and the same number of smaller ships were kept in the harbour . " " Iris " 40 < br > " Nykøbing " < br > " Aalborg " < br > " Christiansund " < br > " Arendal " < br > " Langesund " < br > " Odense " < br > " Flensborg " < br > " Stege " < br > " Staværn " < br > " Viborg " < br > " Naskau " Legacy . The death of Tsar Paul of Russia changed the diplomatic scene and reduced the political importance of the battle , and material losses in the battle were of little importance to the fighting strength of either navy ( the Danish side had taken great care to spare its first - class ships ) . The battle is nevertheless still remembered on the Danish side for the extraordinary valour of the Navy ' s personnel and the many Copenhagen volunteers who fought for hours against overwhelming odds .