Léonard Victor Joseph Charner was born on 13 February 1797 in Saint-Brieuc, Brittany. He became a cadet at the Ecole de Marine in Toulon in February 1812, was appointed a midshipman in 1815 and served in several ships. He was promoted to enseigne de vaisseau in 1820 and lieutenant de vaisseau in 1828. He participated in the Invasion of Algiers in 1830. He recorded his observations in a memoir on the duration of naval manoeuvres. In 1832 Charner received the cross of the Legion of Honour for the capture of Ancona.
During the French Second Republic on 13 May 1849 Charner was elected representative of Côtes-du-Nord in the Legislative Assembly. He sat with the right and supported the policy of President Louis Napoleon. He was a member of the Naval Investigation Commission and was often involved in discussions on technical matters. He was also a member of the Côtes-du-Nord General Council.
After the coup d'état of 2 December 1851 Charner was appointed Chief of Staff of the Minister of the Navy. He was promoted to Rear Admiral on 3 February 1852, and made second in command of the Pacific Ocean Squadron in August 1853. During the Crimean War on 17 October 1854 his battleship, the Napoléon, battled for five hours with Fort Constantin. It fired 3,000 shots and received 100 balls. On 7 June 1855 he was promoted to vice-amiral. He chaired the Naval Works Committee. In May 1860 Charner took command of the naval fores in the China seas and supported the expeditionary force during the Second Opium War. After directing the disembarkation of the troops at Peïo he directed his gunboats to attack the forts that defended the entrance to the river. He was then appointed commander in chief of the land and sea forces in Cochinchina. As soon as the war ended, Charner left for Vietnam in January 1861 with his naval squadron and a force of 3,000 troops to support French troops under Captain Joseph Hyacinthe Louis Jules d'Ariès encircled in Saigon. On February 11, 1861, he relieved the Siege of Saigon, thereby continuing the endeavour of Admiral Rigault de Genouilly, and permitting the establishment of the first French territories in Vietnam. The French Navy Minister Chasseloup-Laubat wrote to Charner: "We wish to draw commerce to Saigon What we want is a sort of suzerainty or sovereignty with free trade accessible to all". After three weeks of combat, ending with the Battle of Kỳ Hòa, Charner managed to relieve the Saigon garrison. These efforts allowed the French to capture three provinces of Cochinchina. Charner was replaced by Admiral Bonard in November 1861, who managed to obtain the recognition of the French conquests by Emperor Tự Đức in 1862, with the June 1862 Treaty of Saigon.
Later career
Charner returned to France in September 1861, and on 22 January 1862 was made a senator. Until his death he sat with the supporters of the imperial regime. He was promoted to admiral by decree of 15 November 1864. He was awarded the Grand Cross of the Legion of Honour on 10 February 1861. Charner died on 7 February 1869 in Paris. Several French Navy ships have been named after him, such as the French cruiser or the Bougainville-class colonial sloopAmiral Charner which fought at the Battle of Koh Chang in the 1941 Franco-Thai War.
