After Napoleon's disastrous campaign in Russia in 1812, one Italian and three French divisions from the garrison of Italy were sent to Germany as reinforcements. By recalling the Italian units serving under Marshal
Louis Gabriel Suchet in Spain and mass conscription, an entirely new army was formed and placed under Napoleon's step-son,
Eugène de Beauharnais. By May 1813, the new Italian army consisted of the 46th, 47th, 48th, and 49th Infantry Divisions, plus one cavalry division. In June, the 50th, 51st, and 52nd Divisions were added. Marcognet received command of the 48th Division. In August 1813, the division consisted of three battalions each of the 29th and 30th Provisional Demi-Brigades, four battalions of the 106th Line Infantry Regiment, and three battalions each of the 1st and 2nd Neapolitan Line Infantry Regiments. After the
Austrian Empire's declaration of war on 12 August 1813, Eugène moved his army east to defend
Illyria. At the end of September, the Franco-Italian army abandoned Illyria and fell back to the
Soča (Isonzo) River. After a pause, the Franco-Italian army retreated again, this time to the
Adige River, which was reached at the end of October. In early November, Eugène reorganized the army and Marcognet emerged as commander of the 4th Division in
Paul Grenier's corps. The 1st Brigade, which was commanded by
Jean-Baptiste Jeanin, comprised the 29th and 31st Provisional Demi-Brigades. The 2nd Brigade under
Vincent Martel Deconchy included the 36th Light, 102nd Line, and 106th Line Infantry Regiments. The 29th Provisional was formed from one battalion each of the 20th and 101st Line; the 31st Provisional was composed of single battalions of the 131st and 132nd Line. In the
Battle of Caldiero on 15 November 1813, Eugène ordered Marcognet's division to attack
Johann von Hiller's Austrian center while
François Jean Baptiste Quesnel's division turned the enemy right flank. Meanwhile,
Marie François Rouyer's division and a cavalry brigade pressed the Austrian left flank. Beginning at 10:00 AM, Marcognet drove back the Austrian center while the other attacks went forward. The day ended in a Franco-Italian success with the Austrians forced back to
Soave. Each side suffered about 500 casualties, but the Austrians also lost 900 soldiers and two guns captured. Having given his enemies a sharp blow, Eugène fell back to
Verona, leaving Marcognet's division on the east bank of the Adige at San Michele. Hiller attacked the French on 18 November but was eventually repulsed after hard fighting. In this encounter, the Austrians lost 1,200 killed and wounded, plus 200 captured, while French casualties numbered 700, including Grenier wounded. After De Conchy's brigade was defeated on the Lower Adige, Eugène sent Marcognet's entire division to defend the area in early December. With his own division plus Nicolas Schmitz's brigade of Rouyer's, Marcognet attacked Anton Gundacker von Starhemberg's 6,000 Austrians at
Boara Pisani on 8 December 1813. Though he had 12,000 men and 18 guns, Marcognet only brought 5,000 into the battle. After initial success, the French halted only to be thrown back by a counterattack at 10:00 PM. The French lost 800 killed and wounded plus 102 captured, while Austrian casualties were somewhat fewer. Marcognet led his division at the
Battle of the Mincio River on 8 February 1814. The Franco-Italian army advanced and blundered into
Count Heinrich von Bellegarde's Austrian army, resulting in a confused meeting engagement. Eugène and Grenier advanced across the
Mincio River on the right and center, pushing back the Austrians in front of them. The divisions of Rouyer and Quesnel led the attack with cavalry on both flanks, supported by Marcognet and
Teodoro Lechi's Italian Guard. Meanwhile,
Jean-Antoine Verdier's troops were barely holding out against greatly superior Austrian forces on the left flank. As Eugène directed Rouyer and Quesnel to the left to help Verdier, he brought Marcognet into the first line. In the end, the French advance was halted by a mass of Austrians and both sides pulled back. The French suffered 3,000 killed and wounded plus 500 captured, while inflicting losses of 2,800 killed and wounded and 1,200 captured on the Austrians. On the night of 9 February 1814, Bellegarde pushed 10,000 foot soldiers and 2,000 horsemen across the river at Borghetto near
Valeggio sul Mincio. After tough fighting, the divisions of Marcognet and Philibert Fressinet drove the Austrians back to the east bank. After this action, Bellegarde abandoned any attempt to force the Mincio and waited for
Joachim Murat's
Neapolitan army to join him from southern Italy. This was followed by a period of confused fighting as Eugène tried to fend off both Bellegarde and Murat. On 10 March, Eugène launched a reconnaissance in force across the Mincio. At
Goito, Jeanin's 3,000-strong brigade of Marcognet's division fought Friedrich Ernst von Spiegel's 4,300 Austrians. Each side employed six pieces of artillery and the action is called an Austrian victory, though no casualties are stated. The campaign ended on 17 April 1814 after Napoleon's abdication when Eugène agreed to evacuate Italy. Marcognet was awarded the
Order of the Iron Crown. After the end of the conflict he was taken off active service. King
Louis XVIII made him a Chevalier of the
Order of Saint Louis on 8 July 1814 and Grand Officer of the Légion d'Honneur on 27 December. ==Waterloo==