La Motte-Picquet joined the Gardes de la Marine in Brest on 11 July 1735, then aged 15. Two years later, he served on the frigateVénus in a campaign against the Barbary corsairs of Salé. On 1 January 1743, he rose to sous-brigadier des gardes de la marine, and then to aide d'artillerie on 10 December, after serving in two campaigns in the English Channel and off Ireland on Mercure, under Dubois de La Motte, in a squadron under comte de Roquefeuil. In January 1745, during the War of the Austrian Succession, after having conducted nine campaigns off Morocco, in the Baltic Sea and in the Caribbean, he transferred on the frigate Renommée, under Captain Guy François de Kersaint. On 6 February 1745, Renommée departed Brest to ferry despatches to Louisbourg, then blockaded by the British. Taking advantage of the fog and the ice that hindered the British cruisers, the frigate managed to anchor at Baie des Castors, where she still had to fight off several smaller British ships. On 16 June 1746, on her third trip from Canada, Renommée met a British squadron under Admiral George Anson. In the ensuing battle, Kersaint was gravely wounded and La Motte-Picquet took command, managing to escape to Port-Louis. La Motte-Picquet himself had his cheek cut away by a cannonball. On 24 February 1784, La Motte-Picquet departed Brest as first officer on the 24-gun frigate Cumberland, under Captain Mézédern, bound for Ile de France and Ile Bourbon. After calling A Coruña, Cumberland encountered a British 36-gun frigate, leading to an inconclusive battle where she lost 25 killed or wounded. After a 122-day travel, Cumberland reached Bourbon, and then Ile de France. From there, she departed for a cruise off India on 20 October 1748.. Peace being restored in October 1748 with the Treaty of Aix-la-Chapelle, La Motte-Picquet cruised in the Caribbean, in the Atlantic and the Indian Ocean. In 1754, he rose to the rank of Lieutenant de Vaisseau.
Seven Years' War
In 1755, La Motte-Picquet earned his first command. In October 1756, he was made a Knight in the Order of Saint-Louis. In 1757, La Motte-Picquet was part of the staff of the 74-gunDiadème, under Captain Rosily-Méros, part of the squadron under Dubois de La Motte tasked to challenge the British off Québec. In 1758, he fought off Fort de Portzic in Brest Roads, and had to report his actions before the Secretary of State for the Navy Arnouville.. In 1760, he was on convoy escort duty between Brest and Rochefort. In 1762, he was promoted to Captain and appointed to Diadème. After the Peace of Paris in 1763, La Motte-Picquet served in squadrons under Admiral d'Orvilliers and Duchaffaut. In September 1763, he was given command of the 32-gun frigate Malicieuse to undertake a 6-month cruise off Canada. In the next years, he conducted several raids against the Barbary corsairs of Salé. In 1772, commanding the 16-gun corvette Cerf-Volant, he distinguished himself in a training squadron under Orvilliers. In 1776, he was given command of the 64-gun ship of the lineSolitaire, with Louis Philippe II, Duke of Orléans as a notable participant.
In June 1777, Lamotte-Picquet commanded the 74-gun Robuste. On 14 February 1778, he fired a nine-gun salute for USS Ranger, marking the first time a foreign warship recognised the US flag. In 1778, as a Squadron Commander, he took part in the Battle of Ouessant on the Saint-Esprit, and then cruised the English seas. During one month, he captured thirteen ships. During the American Revolutionary War, Picquet de la Motte distinguished himself as a member of Admiral d'Estaing's squadron in Martinique, during the Battle of Grenada, and the Siege of Savannah. . On 18 December 1779, he attacked a British squadron under the command of Admiral Hyde Parker that was attempting to blockade a French convoy off Martinique; in the ensuing Battle of Martinique, La Motte-Picquet so impressed Hyde Parker that he sent him a letter of congratulation: In 1781, as commander of a nine-vessel squadron that included three frigates, Picquet de la Motte intercepted the fleet of Admiral Rodney en route from St. Eustatius which the British had captured in February 1781. Picquet de la Motte captured 26 British ships, along with Rodney's plunder in the amount of 5 million sterling. Soon afterwards he was promoted to Lieutenant General of the Naval Armies.
Death
After fifty-two years of service and severe attacks of gout in his later years, La Motte-Piquet died on 11 June 1791 in Brest, aged 70. He was buried in the local graveyard.
