William Cornwallis Admiral the Honourable Sir William Cornwallis GCB ( 10 February 1744 – 5 July 1819 ) was a Royal Navy officer who fought in the Napoleonic Wars . He was the brother of Charles Cornwallis , the 1st Marquess Cornwallis , British commander at the siege of Yorktown . Cornwallis took part in a number of decisive battles including the Siege of Louisbourg in 1758 and the Battle of the Saintes but is best known as a friend to Nelson and as the Commander - in - chief of the Channel Fleet during the Napoleonic war . He is depicted in the Horatio Hornblower novel , " Hornblower and the Hotspur " . Early life . William Cornwallis was born 10 February 1744 . His father was Charles the fifth baron and first earl Cornwallis and his mother was Elizabeth , daughter of Viscount Charles Townshend . William was the younger brother of General Charles Cornwallis . Seven Years ' War . The young William entered the navy in 1755 aboard the 80 - gun bound for North America in the fleet of Admiral Edward Boscawen . Cornwallis was shortly after exchanged into and was present in her at the Siege of Louisbourg in 1758 . The siege itself was one of the pivotal battles of the war . Louisbourg , was the only deep water harbour that the French controlled in North America and with its capture it enabled the British to launch an attack on Quebec City . General James Wolfe ' s attack on Quebec City at the Battle of the Plains of Abraham saw the beginning of the end of French colonisation in North America . When the " Kingston " returned to England in 1759 , Cornwallis was taken aboard the 60 - gun by Captain Robert Digby . During the planned French invasion of Britain in 1759 the " Dunkirk " was with Admiral Edward Hawke ' s squadron and took part in the Battle of Quiberon Bay against the French fleet under Admiral Conflans . The victory was part of what became known as " Annus Mirabilis of 1759 " and in concert with the other victories of that year gave the Royal Navy almost complete dominance over the oceans for over a century . The succession of victories led Horace Walpole to remark " our bells are worn threadbare ringing for victories " . Cornwallis remained in the " Dunkirk " when she was assigned to the Mediterranean fleet then commanded by Admiral Charles Saunders . " Dunkirk " was detached on blockade duty , ensuring the French fleet remained in the city of Heraklion , Crete . Cornwallis moved to Saunders ' flagship where he remained for little over a year . On 5 April 1761 Cornwallis passed his examination for lieutenant and was promoted into the newly commissioned third - rate . In July 1761 Cornwallis was with " Thunderer " and two other line - of - battle ships blockading Cadiz . Two French ships escaped the blockade and the British squadron set off in pursuit . " Thunderer " caught up with the 64 - gun " Achille " and captured her in a single - ship action that lasted about half an hour . The British lost seventeen killed and one hundred and thirteen wounded . In July 1762 Cornwallis received his first command in the 8 - gun sloop - of - war . In 1763 he was given command of the more powerful and newly launched 14 - gun . He continued in her into the peace with France after the Treaty of Paris had ended the war in 1763 . During the peace in 1765 he was promoted post - captain and given command of the 44 - gun . He commanded her until she was paid off and the ship was sold in 1766 . In September of the same year he was given command of and was variously employed throughout the peace between the Seven Years ' War and the outbreak of the American Revolutionary War . American Revolutionary War . When the French lent their official support to the American cause in 1778 with the Treaty of Alliance and the Treaty of Amity and Commerce , the war between Britain and the United States became a global war . Captain Cornwallis was in command the newly commissioned . The " Lion " was sent , with Admiral John Byron , to the West Indies . Battle of Grenada . When war was officially declared , the Comte d ' Estaing , the French naval commander in North America swiftly captured the islands of Saint Vincent and Grenada . Byron on hearing the news that Saint Vincent had been captured assembled his forces but on his way to recapture the island he received intelligence that d ' Estaing and his fleet were in the process of capturing Grenada . Byron consequently took his fleet to Grenada in the hopes of engaging them and preventing the capture of Grenada . The island however had only held out for two days and was already in French hands . The Battle of Grenada took place on 6 July 1779 d ' Estaing saw the British fleet of 21 ships of the line approaching and weighed anchor . Byron gave chase and attempted to form line of battle as per the Sailing and Fighting Instructions set down by Admiral Blake in 1653 . d ' Estaing , realising that his force although superior in guns was not so in numbers , had ordered his captains not to engage directly but to bear away when British ships approached and to bear down on any individual ship that might through wind or poor seamanship become separated from the line . This tactic proved successful and d ' Estaing ' s ships managed to escape the superior force causing considerable damage to three of the British ships . Cornwallis ' " Lion " was one of those ships and when he became separated from the British fleet she was forced to break away and make a run for Jamaica rather than risk capture . " Lion " suffered a reported 21 killed and 30 wounded . Duty in the West Indies . During his time in the West Indies , Cornwallis came to own , then later free the " doctoress " Cubah Cornwallis . Cubah became Cornwallis ' mistress and housekeeper in Port Royal , Jamaica . Later she treated Cornwallis ' friend , Captain Horatio Nelson on his return from the disastrous mission to Nicaragua . She also treated Prince William Henry , later William IV when he was stationed in the West Indies . " Lion " remained on the Jamaica station under the orders of Admiral Peter Parker and when she was repaired began a series of cruises in the West Indies . On 20 April 1780 Cornwallis was in command of a small squadron of two line - of - battle ships , the " Lion " and and one large 44 - gun frigate , . Off Saint - Domingue the small British squadron discovered a convoy under the protection of 4 ships - of - the - line and one frigate commanded by Monsieur de la Motte Picquet . The French chased and the British ran . The French outsailed the British ships and when in range opened fire . The chase continued throughout the night and into the morning of the 21st . The breeze died and the two squadrons began to repair their damage . When the wind blew once more the chase renewed and continued throughout the night of the 21st and into the 22nd . On the morning of the 22nd three sails appeared to leeward . The arrival of these new sails would determine the outcome of the battle . The newcomers proved to be the 64 - gun , the 33 - gun and the 28 - gun . The French squadron bore away for Cap - Français , leaving the two small British squadrons to repair and make for Jamaica . The British squadron under Cornwallis had lost 12 killed including Captain Glover of the " Janus " . Cornwallis returned to England in the " Lion " in June 1781 and was appointed to command the 74 - gun third - rate . He immediately returned to the West Indies under the orders of Admiral Samuel Hood , 1st Viscount Hood . " Canada " was with Hood ' s fleet at the Battle of St . Kitts in 1782 . Hood took his 21 ships of the line and lured the French fleet of 29 ships of the line under the Comte de Grasse from its anchorage at Basseterre on St . Kitts and then sailed into the roadstead and anchored . Hood then repulsed de Grasse ' s efforts to dislodge the British fleet . The Battle of Brimstone Hill sealed the fate of the island despite Hood ' s efforts and St . Kitts fell into French hands . With the island in enemy hands and the French fleet cruising off the harbour , Hood was forced to withdraw and made his way to Antigua . The " Canada " in Commodore Edmund Affleck ' s division suffered 1 killed and 12 wounded . On 22 March Hood joined Admiral George Rodney ' s fleet in Barbados Battle of the Saintes . Between 9 April 1782 and 12 April 1782 , " Canada " made up part of the fleet of Admiral Rodney at the Battle of the Saintes . During the battle , Cornwallis and " Canada " were fourth in line on the starboard tack in the centre division between and . " Canada " sustained 35 casualties in total with 12 killed and the rest wounded . The outcome of the battle meant that the French and Spanish abandoned their planned invasion of Britain ' s most valuable Caribbean island , Jamaica . The battle , although a victory for the English caused a great deal of controversy in later years that included Cornwallis ' direct criticism in writing of Rodney . The final couplet of the poem said to have been written in Cornwallis ' own hand reads : It appears that the criticisms of Admiral Hood and Cornwallis went unheard and Rodney was created a baron and given a life pension of £2 , 000 per year . Cornwallis was sent home under Rear - Admiral Thomas Graves with the convoy that included the captured French flagship " Ville de Paris " . A violent storm hit the convoy and the " Ville de Paris " sank along with several of the convoy and one of the escorts , . The convoy and her escorts finally arrived at Portsmouth and the " Canada " was paid off in October 1782 . Home service and peace . In January 1783 Cornwallis was given command of and in March of the same year was moved to HM Yacht " Charlotte " . The war between Britain and the allied forces of America and France ended in September 1783 with the signing of the Treaty of Paris and with the peace came the downsizing of the navy . Cornwallis however remained employed in command of the Royal Yacht until 1787 . In 1787 he was briefly given command of before hoisting his broad pennant as commodore in the 64 - gun in October 1788 when he was appointed commander - in - chief of the East Indies Station . Third Anglo - Mysore War . In November 1791 Cornwallis ordered that French shipping be intercepted and searched for contraband . The British and French were not at war but the French were openly aiding the Tipu Sultan in his war against the British . Cornwallis detached Captain Richard Strachan in to intercept the French frigate " Résolue " and two French merchant ships that were heading for the French held port of Mangalore . The subsequent Battle of Tellicherry French Revolutionary Wars . Though the conflict with Tipu Sultan was over , the French Revolutionary Wars had only begun . Promoted to rear - admiral on 1 February 1793 , Cornwallis remained in the area and aided in the capture of Pondicherry , captaining his new flagship , the frigate , and commanding a small flotilla of three East Indiamen — " Triton " , " Princess Charlotte " , and . He left command of Pondicherry to Captain King and returned to England , docking at Spithead in August 1793 . In May 1794 he hoisted his flag aboard the 74 - gun and was promoted vice - admiral of the blue squadron . In August he shifted his flag to the newer and larger 80 - gun and then once more in December to the first rate . Throughout this period he was in command of various divisions within the Channel Fleet . The Channel Fleet was responsible for preventing invasion from France and for the blockade of French Channel ports . First Battle of Groix . On 16 June 1795 he was in command of a small squadron that sighted a much larger French fleet . The ensuing action became famously known as " The Retreat of Cornwallis . " Cornwallis was cruising near Brest with five ships of the line , the , , , , , two frigates and one cutter , , , when a French fleet of twelve sail of the line and fourteen large frigates appeared , commanded by Admiral Villaret Joyeuse . The odds being very greatly against him , he was compelled to order a retreat . But two of his ships were slow and unweatherly and fell behind the rest . The van of the French fleet began to catch the two slower British ships . The rearmost ship , the " Mars " , was caught and suffered severely in her rigging and was in danger of being surrounded by the French . Witnessing this , Cornwallis turned his squadron around to support her . The French admiral made the assumption that Cornwallis must have sighted assistance beyond his own field of vision and had turned to engage the enemy knowing that a superior force was nearby to come to their relief . The French admiral ordered his ships to disengage and Cornwallis and his small squadron retreated in order . The action is remarkable evidence of the moral superiority which the victory of the Glorious First of June , and the known efficiency of the British crews , had given to the Royal Navy . The reputation of Cornwallis was amplified and the praise given him was no doubt the greater because he was personally very popular with officers and men . Court martial . In 1796 Cornwallis incurred a court - martial ( in consequence of a misunderstanding and apparently some temper on both sides ) on the charge of refusing to obey an order from the Admiralty . He was practically acquitted . The substance of the case was that he demurred on the ground of health at being called upon to go to the West Indies , in a small frigate , and without " comfort " . Command of the Channel Fleet . Cornwallis was promoted admiral of the blue squadron in 1799 and held the Channel Command for a short interval when Admiral Jervis ( Earl St . Vincent ) fell ill in 1801 . Cornwallis took command once more when Jervis stood down as commander and became first lord of the Admiralty between 1801 to 1804 . During this time Cornwallis was in charge of protecting the coast of the United Kingdom as Napoleon was building a large invasion force . Following Lord Nelson ' s victory at Trafalgar , Cornwallis was removed from his post and Earl St . Vincent took his place . Honours and politics . In 1796 , Cornwallis was promoted to Rear - Admiral of Great Britain , the title becoming Rear - Admiral of the United Kingdom after the Act of Union came into force in 1801 , and then in 1814 he was promoted to Vice - Admiral of the United Kingdom His greatest honours might be considered to be his various nicknames among the sailors , " Billy go tight " ( given on account of his rubicund complexion ) , as well as " Billy Blue " , " Coachee " , and " Mr Whip " . Sailors appear to have only given nicknames to those commanders whom they liked . The various nicknames of Cornwallis seem to show that he was regarded with more of affection than reverence . Cornwallis was also made a Knight Grand Cross of the Order of the Bath in 1815 . Cornwallis served as Member of Parliament ( MP ) for Eye during the periods , 1768 – 1774 , 1782 – 1784 , 1790 – 1800 and , 1801 – 1807 . He also served as MP for Portsmouth from 1782 to 1790 . Later life . Cornwallis never married . In 1800 he leased and later purchased the Newlands estate in Milford on Sea in Hampshire . He was joined by his close friend and fellow naval officer Captain John Whitby and his wife Mary Anna Theresa Whitby . John Whitby died in 1806 , but Mary and her infant daughter Theresa stayed on looking after Cornwallis into his old age . On Sir William Cornwallis ' death in 1819 , Mary Whitby and her daughter inherited his fortune . References . Schom , A . ( 1990 ) . " Trafalgar : Countdown to battle 1803 – 1805 . " New York : Atheneum .