In one of the last actions of the Napoleonic Wars, Exelmans led Strolz's division, the 2nd Cavalry Division under General Hippolyte Guillaume Piré, three battalions of the 44th Line Infantry Regiment, and a half battalion of the Sèvres National Guard in hunting down "Oberstleutnant" Eston von Sohr's Prussian cavalry brigade. In the Battle of Rocquencourt on 1 July, the 3rd "Brandenburg" and 5th "Pommeranian" Hussar Regiments were wrecked, suffering 500 casualties out of the 750 horsemen in Sohr's brigade. French losses were negligible.