At the Battle of Jena on 14 October 1806, Margaron led one of Soult's two IV Corps light cavalry brigades. His brigade consisted of the 8th Hussars and 22nd Chasseurs à Cheval. At Jena, Soult attacked 5,000 Prussians under Friedrich Jacob von Holtzendorff guarding the northern flank. Surprised by French troops lunging at his left flank, Holtzendorff withdrew in good order, well covered by his cavalry. At length, Soult's light cavalry burst through the Prussian cavalry and light infantry screen and pounced on one of the retreating Prussian columns, capturing 400 men, six artillery pieces and two colors. After deploying his troops near the village of Nerkwitz, Holtzendorff found French infantry circling his left flank while Soult's cavalry charged from the front. The Prussian force collapsed; its cavalry rallied later, but the infantry fled from the field. Margaron's brigade fought at the Battle of Lübeck on 6–7 November 1806.