1805–1809 At the
Battle of Austerlitz on 2 December 1805, Jacquinot served as an aide-de-camp to
Géraud Duroc who led a formation of grenadiers. He became
colonel on 13 January 1806, taking command of the 11th Chasseurs à Cheval Regiment. He led his regiment at the
Battle of Jena on 14 October 1806 and was wounded by several saber cuts. At
Jena, the 11th Chasseurs were in
Pierre Margaron's light cavalry brigade of the
IV Corps under
Marshal of France Jean-de-Dieu Soult. He was raised to the dignity of
Baron of the Empire on 26 October 1808. Jacquinot received promotion to
general of brigade on 10 March 1809. He received command of a brigade of cavalry in Montbrun's light cavalry division in the
III Corps of Marshal
Louis-Nicolas Davout. On 16 April he had 1,797 troopers under his command in the 1st, 2nd and 12th Chasseurs à Cheval Regiments. On 20 April, Napoleon formed for Marshal
Jean Lannes a provisional corps made up of Jacquinot's detached brigade, two III Corps infantry divisions and two
cuirassier divisions. In the
Battle of Abensberg Lannes' corps drove the Austrian left wing back and inflicted losses of 2,700 killed and wounded and 4,000 captured on their foes. Jacquinot's brigade fought at the
Battle of Raab on 14 June under Montbrun's command. On this occasion, it included the 7th Hussars in place of the 12th Chasseurs. During the battle, the divisions of Montbrun and
Emmanuel Grouchy routed the Austrian left flank cavalry. Still in Montbrun's division, Jacquinot led his 1,219-strong brigade at the
Battle of Wagram on 5–6 July where it formed part of the right wing cavalry under the orders of Davout. On the second day, Davout's cavalry gained the upper hand despite the intervention of the Austrian reserve cavalry personally led by
Archduke Charles, Duke of Teschen.
1812–1814 During the 1812
French invasion of Russia Jacquinot led a brigade composed of the 7th
Hussar and 9th
Chevau-léger Lancer Regiments. The 3rd Light Cavalry Brigade was part of
Jean Pierre Joseph Bruyère's 1st Light Cavalry Division in
Étienne Marie Antoine Champion de Nansouty's
I Cavalry Corps. During the campaign, he led his brigade at the battles of
Ostrovno,
Vitebsk,
Smolensk and
Borodino. Near Mozhaysk his brigade fought off
Matvei Platov's
Don Cossacks. Jacquinot was wounded while leading a charge against a Swedish battalion at the
Battle of Dennewitz on 6 September 1813. During the action, he led the 12th Light Cavalry Brigade which was made up of the 5th and 13th Chasseurs à Cheval Regiments. The brigade was part of
Jean Thomas Guillaume Lorge's 5th Light Cavalry Division in
Jean-Toussaint Arrighi de Casanova's
III Cavalry Corps. At the
Battle of Leipzig on 16–19 October he led the same brigade, to which was added the 10th Chasseurs à Cheval. He was promoted
general of division on 26 October 1813. On the night of 31 December 1813, Russian troops under
Emmanuel de Saint-Priest executed a successful assault crossing of the
Rhine River and captured
Koblenz at 4:00 am on 1 January 1814. The commander of the Russian 17th Infantry Division, Igor Maximovich Pillar sent 200
jägers, 25 Cossacks and one cannon to seize a convoy near
Remagen on 2 January. The convoy was intercepted, but the officer directing the column continued marching toward
Bonn where he bumped into a large French force under Jacquinot and
Joseph Jean-Baptiste Albert. The Russians were routed, losing 120 men and the artillery piece, the first cannon lost by the Army of Silesia. At that date, Jacquinot's heavy cavalry division in the III Cavalry Corps had two weak brigades composed of single-squadron regiments. Marc François Jérôme Wolff's brigade counted 368 officers and men from five dragoon regiments. Jean Charles Quinette de Cernay's brigade numbered 467 troopers from five dragoon and one cuirassier regiments. By mid-January, the French forces under Marshal
Jacques MacDonald, which included III Cavalry Corps, were in full retreat through
Namur and headed for an intended rendezvous with Napoleon at
Châlons-sur-Marne. After detaching garrisons, MacDonald's command numbered no more than 11,000 men. From Châlons, MacDonald's force was chased to the west by the Army of Silesia. Around this time, Napoleon reorganized his cavalry into four corps plus an independent division and the III Cavalry Corps was suppressed. Jacquinot was placed in command of the two-brigade 4th Light Cavalry Division in the new
VI Cavalry Corps under
François Étienne de Kellermann.
Auguste Jean Ameil's 979-strong 7th Brigade included six regiments of chasseurs à cheval while Wolff's 686-man 8th Brigade comprised three hussar, one chevau-léger lancer and two chasseurs à cheval regiments. On 25 February 1814, Napoleon decided to leave the pursuit of the
Army of Bohemia to his subordinates. The emperor assigned Jacquinot's division and Kellermann's corps to Marshal
Nicolas Oudinot while distributing other cavalry units to MacDonald. Jacquinot's division fought at the
Battle of Bar-sur-Aube on 27 February and at the
Battle of Saint-Dizier on 26 March. During Napoleon's bid to cut the Allied communications in the last week of March, he sent the light cavalry of Jacquinot and
Hippolyte Piré ahead of the army, provoking panic. At
Saint-Dizier, Napoleon's cavalry routed
Ferdinand von Wintzingerode's 10,000 cavalry, but it proved to be a hollow victory because the Allied generals ignored the threat to their supply line and marched on Paris. The Allies won the
Battle of Paris on 30 March 1814 and this event ended the war. By 4 April the 4th Cavalry Division had shrunk badly. Ameil's brigade counted only 331 officers and men while Wolff's brigade numbered only 244. ==Later career==