The Battle of Nördlingen took place on 6 September 1634 during the Thirty Years' War. A combined Imperial-Spanish force won a crushing victory over a Swedish-German army.
By 1634, the Swedes and their Protestant German allies occupied much of Southern Germany and blocked the Spanish Road, an overland supply route used by the Spanish to funnel troops and supplies from Italy to support their ongoing war against the Dutch Republic. In order to regain control of this, a Spanish army under Cardinal-Infante Ferdinand linked up with an Imperial force led by Ferdinand of Hungary near the town of Nördlingen, which was held by a Swedish garrison.
A Swedish-German army commanded by Gustav Horn and Bernhard of Saxe-Weimar marched to its relief but they significantly underestimated the number and calibre of the Imperial-Spanish troops facing them. On 6 September, Horn launched a series of assaults against earthworks constructed on the hills to the south of Nördlingen, all of which were repulsed. Superior numbers meant the Spanish-Imperial commanders could continually reinforce their positions and Horn eventually began to retreat.