As a young officer in Napoleon's Army, Dupont was ordered to deliver a disagreeable message to a fellow officer, Fournier, a rabid duellist. Fournier, taking out his subsequent rage on the messenger, challenged Dupont to a duel. This sparked a succession of encounters, waged with sword and pistol, that spanned decades. The contest was eventually resolved when Dupont was able to overcome Fournier in a pistol duel, forcing him to promise never to bother him again.
They fought their first duel in 1794 from which Fournier demanded a rematch. This rematch resulted in at least another 30 duels over the next 19 years in which the two officers fought mounted, on foot, with swords, rapiers, sabres and pistols. Again deprived of his rank because of financial dishonesty and illegal absences, he was reinstated once more and became the aide-de-camp of GeneralPierre Augereau. Involved in the curious affair of Donnadieu and suspected of conspiracy against the First Consul, Fournier was arrested in May 1802, and imprisoned in the Temple, and later in Périgueux under house arrest.
In April 1805, he was reinstated again as commander of the 600 men of the expedition of Rear-AdmiralCharles René Magon de Médine in Martinique, but never disembarked and returned to France. Protected by Antoine Charles Louis de Lasalle, who found Fournier a good alter ego ready for any and all escapades, he became the commander of his staff and distinguished himself in 1807 in cavalry charges at the battles of Eylau, Guttstadt and Friedland. Fournier-Sarlovèze was afterwards send to Spain and between 18 and 23 May 1809, succeeded in defending the town of Lugo for five days with only 1,500 men against 20,000 attackers. He attracted attention once more by giving some slashes of his sabre to an aide-de-camp placed under his orders by State SecretaryPierre Antoine Noël Bruno, comte Daru, a fact that caused him once again to be placed on leave without pay. Since his services were needed, he set off again with the IX Corps of Jean-Baptiste Drouet, Comte d'Erlon. He distinguished himself once again in anti-guerrilla operations and in his charge of May 5, 1811, at the Battle of Fuentes de Oñoro, where, with his brigade, he penetrated and sabred three English infantry squares.
re-established him in his grade in the First Restoration, and Fournier did not serve in the Hundred Days Campaign. In 1819, Louis XVIII permitted him to add the family name of Sarlovèze onto his name and promoted him as inspector-general of the cavalry. He also took part in the preparation of the new military code.
The story of Fournier-Sarlovèze and Dupont was fictionalized in Joseph Conrad's short storyThe Duel. Conrad's short story was adapted to film by Ridley Scott as The Duellists.