[2] During the 1800 campaign, Jacquinot received a battlefield promotion from captain to major after an action at Erbach an der Donau.

He was wounded at the Battle of Hohenlinden on 3 December 1800 while acting commander of the regiment in the absence of Colonel Louis-Pierre Montbrun.

At Schwanenstadt, the French captured 700 Austrian cavalrymen and at Vöcklabruck they made prisoners of General Franz von Löpper, two cannons and most of two battalions of infantry.

[5] 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.

[5] 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.

In the Battle of Abensberg Lannes' corps drove the Austrian left wing back 10 miles (16 km) and inflicted losses of 2,700 killed and wounded and 4,000 captured on their foes.

[12] 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.

[14] During the 1812 French invasion of Russia Jacquinot led a brigade composed of the 7th Hussar and 9th Chevau-léger Lancer Regiments.

[7] 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[18] 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.

[20] 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.

The emperor assigned Jacquinot's division and Kellermann's corps to Marshal Nicolas Oudinot while distributing other cavalry units to MacDonald.

[5] 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.

[29] During the Waterloo Campaign, Jacquinot commanded the 1st Cavalry Division which was attached to the I Corps of Jean-Baptiste Drouet, Comte d'Erlon.

[30] During the Battle of Waterloo on 18 June 1815 Jacquinot supervised his own and the light cavalry division of Jacques Gervais, baron Subervie.

[5] After the British heavy cavalry routed d'Erlon's infantry, the Royal Scots Greys charged through the French grand battery, only to be counterattacked by Jacquinot's lancers and cut to pieces.