The Thirty Years' War left hard mark in Eilenburg. First the town was spared of fighting, but it already suffered from the catastrophic economic effects of the war. From the year 1631 the town was directly involved in the war. In 1632 the body of Gustav II Adolf, King of the Swedish, was laid out in "Red Deer Inn" ("Gasthof Roter Hirsch") after he had been killed in the Battle of Lützen the 16 November 1632. In 1639 Eilenburg was conquered by the troops of Georg von Derfflinger. In 1646 peace negotiations between Saxony and Sweden began in Eilenburg to extend the expiring Armistice of Kötzschenbroda. The 14 September 1648 the Treaty of Eilenburg was made and meant the end of the Thirty Years' War for total Saxony. Subsequently the town recovered. 