Napoleonic Wars
In the War of the Third Coalition, Beaumont led the 3rd Dragoon Division, which included 18 squadrons in the 5th, 8th, 9th, 12th, and 16th Dragoon Regiments, and a horse artillery battery. His brigadiers were Charles Joseph Boyé and Nicolas-Joseph Scalfort. Under the overall leadership of Marshal Joachim Murat, he led his 2,400 troopers into action at the Battle of Wertingen on 8 October 1805. The French cavalry, including Beaumont's division, Louis Klein's 1st Dragoon Division, Anne-François-Charles Trelliard's Light Cavalry Brigade, and Étienne Marie Antoine Champion de Nansouty's 1st Cuirassier Division, marched from Rain early that morning. Moving south along the Lech River to Nordendorf, they turned west and appeared before Franz Xavier Auffenburg's 5,400 Austrians at Wertingen.
Klein's division marched south and west to flank the Austrians, while Beaumont and Trelliard attacked in front. Major Rémi Joseph Isidore Exelmans led an attack by 200 dismounted dragoons which cleared the Austrians out of an outlying village. The French found the nine enemy battalions drawn up behind Wertingen in one large square. The formation was attacked with the help of Nicolas Oudinot's infantry division and driven back in increasing confusion. Finally, the Austrians fled, leaving 2,000 prisoners in French hands.
After the Austrians surrendered at the Battle of Ulm, Napoleon's army pursued a rear guard led by Maximilian, Count of Merveldt to the east. Murat's cavalry attacked between 4,000 and 6,000 Austrians near Ried im Innkreis on 30 October. A portion of the rear guard was driven into a defile. Murat sent in chasseurs à cheval and dismounted dragoons to crush this force, capturing 500 to 600 prisoners. The next day, 4,000 troops from Merveldt's rear guard under Emmanuel von Schustekh-Herve made a stand at Lambach on the Traun River. Three battalions of the Ignaz Gyulai Infantry Regiment, two squadrons of the Kaiser Dragoons # 1, and eight squadrons of the Kaiser Hussars # 1 were supported by four Russian jager battalions and a squadron of hussars. Murat ordered Beaumont's 3rd Dragoon Division and Baptiste Pierre Bisson's 1st Division of Davout's III Corps to attack. The Allies were driven back, with the Russians suffering 100 killed and less than 50 wounded. French losses were "slight" though Bisson was wounded. Beaumont fought at the Battle of Austerlitz, leading the 5th, 8th, 12th, 16th, and 21st Dragoon Regiments. He was named a Grand Officer of the Légion d'Honneur on 10 February 1806.
Beaumont led the 3rd Dragoon Division at the Battle of Jena on 14 October 1806 in the War of the Fourth Coalition. His division was one of the three present with Marshal Joachim Murat at the Capitulation of Erfurt. The 3rd Division included the 5th, 8th, 12th, 16th, 19th, and 21st Dragoon Regiments. He was active in the pursuit of Prince Hohenlohe's Prussian corps. He was present in the action of Zehdenick on 26 October. Beaumont played a prominent role at the Battle of Prenzlau on 28 October. After the Prussian rear guard under Prince Augustus of Prussia became separated from the marching column, Beaumont charged it repeatedly, driving it northward. He finally pinned the rear guard against the Uecker River, forcing it to surrender. Hohenlohe capitulated with his main body soon afterward. He was present at the Battle of Czarnowo on 23 December 1806.
Emperor Napoleon named Beaumont a Senator on 14 August 1807 and a Count of the Empire in March 1808. That year he was also awarded the Order of the Iron Crown, the Military Order of Max Joseph of Bavaria, and the Order of Fidelity of Baden.
In 1809 Beaumont commanded the Reserve Division under Marshal François Christophe de Kellermann. Based at Frankfurt-on-the-Main, the all-arms unit consisted of 826 men from elite companies of line and light infantry regiments, 1,251 Württemberg infantry, 527 Bavarian infantry, a 160-man foot artillery company with eight guns, and the following provisional dragoon regiments, 1st - 697 sabers, 2nd - 669 sabers, 3rd - 515 sabers, 4th - 771 sabers, and 5th - 792 sabers. This force did not fight at the Battle of Wagram.
In 1814, the Senate officially passed laws deposing Napoleon. King Louis XVIII bestowed the Order of Saint Louis on Beaumont in June 1814. He was not employed during the Hundred Days. After the Bourbon Restoration he commanded a division in the Army of Paris.
