Born in
Montpellier, France, of a
noble family, he joined the French army in 1773 and entered upon active service in 1780, as
aide-de-camp to
Rochambeau in the
American Revolutionary War. He had a share in all the principal engagements that occurred during a period of nearly two years. On the conclusion of peace in 1783 he returned to France as a major. During 1784 to 1786 Dumas explored the archipelago and the coasts of
Turkey. He was present at the siege of
Amsterdam in 1787, where he co-operated with the
Dutch against the
Prussians. After the outbreak of the
French Revolution (1789) he acted with
Lafayette and the constitutional liberal party. The
National Constituent Assembly entrusted him with the command of the escort which conducted King
Louis XVI to
Paris after the
Flight to Varennes (June 1791). In 1791 as a
maréchal de camp he was appointed to a command at
Metz, where he rendered important service in improving the discipline of the troops. Chosen a member of the
Legislative Assembly in the same year by the
département of
Seine-et-Oise, he was in 1792 elected president of the Assembly. When the extreme republicans gained the ascendancy, however, he judged it prudent to make his escape to
England. Returning after a brief interval, under the apprehension that his father-in-law would be held responsible for his absence, he arrived in Paris in the midst of the
Reign of Terror, and had to flee to
Switzerland. Soon after his return to France he was elected a member of the
Council of Ancients in the period of the
Directory. After the coup of the 18th Fructidor (4 September 1797) Dumas, being proscribed as a
monarchist, made his escape to
Holstein, where he wrote the first part of his
Précis des événements militaires (published anonymously at Hamburg, 1800). Recalled to his native country when
Bonaparte became
First Consul (1799), Dumas took over the organisation of the "Army of Reserve" at
Dijon. In 1805 he was nominated a councillor of state. He did good service at the
Battle of Austerlitz (2 December 1805), and went in 1806 to
Naples, where he became minister of war to
Joseph Bonaparte. On the transfer of Joseph to the throne of Spain (1808), Dumas rejoined the French army, with which he served in
Spain during the campaign of 1808, and in
Germany during that of 1809. After the
Battle of Wagram (5–6 July 1809), Dumas participated in negotiating the armistice with
Austria. In 1810 he became grand officer of the
Legion of Honour and a count of the
Empire. In the
Russian campaign of 1812 he held the post of intendant-general of the army, which involved the charge of the administrative department. The privations he suffered in the retreat from
Moscow brought on a dangerous illness. Resuming, on his recovery, his duties as intendant-general, he took part in the battles of 1813, and was made prisoner after the capitulation of
Dresden. On the accession of
Louis XVIII (1814), Dumas rendered his new sovereign important services in connection with the administration of the army. When
Napoleon returned from
Elba in the
Hundred Days (1815), Dumas at first kept himself in retirement, but Joseph Bonaparte persuaded him to present himself to the Emperor, who employed him in organising the
National Guard. Obliged to retire after the restoration of Louis XVIII (1815), Dumas devoted his leisure to the continuation of his
Précis des événements militaires, of which nineteen volumes, embracing the history of the war from 1798 to the peace of 1807, appeared between 1817 and 1826. A growing weakness of sight, ending in blindness, prevented him from carrying the work further, but he translated
Napier's
Peninsular War as a sort of continuation to it. In 1818 Dumas returned to favour and became a member of the council of state, from which, however, he was excluded in 1822. After the
July Revolution of 1830, in which he took an active part, Dumas was created a peer of France, and re-entered the council of state. He died in Paris on 16 October 1837. Besides the
Précis des événements militaires, which forms a valuable source for the history of the period, Dumas wrote
Souvenirs du lieutenant-général Comte Mathieu Dumas (published posthumously by his son, Paris, 1839). ==Sources==