In the War of the Fourth Coalition, the 5th Hussars were assigned to Antoine Lasalle's light cavalry division and brigaded with the 7th Hussars. The hussar brigade helped rout a Prussian flank guard at Zehdenick on 26 October 1806 and fought at the Battle of Prenzlau on the 28th. On 30 October the Capitulation of Stettin occurred. With only 800 hussars, Lasalle bluffed Friedrich Romberg into surrendering the fortress and its garrison of 5,300 Prussians. The demand to surrender was carried by Schwarz, who addressed Romberg, "I’ve been sent by my superior, the Grand Duke of Berg, who summons you to surrender to him tomorrow morning. You will be granted the honors of war." Romberg refused, but Schwarz returned an hour later with an ultimatum announcing that a bombardment would precede an attack by 50,000 troops if Stettin was not surrendered by 8:00 AM. Furthermore, the garrison would not be granted quarter and the town would be sacked. At this, Romberg caved in. The 5th Hussars fought at the Battle of Golymin on 26 December 1806. Schwarz became a general of brigade on 30 December 1806 and a Baron of the Empire on 9 March 1808.