The Battle of the Alte Veste was a significant battle of the Thirty Years' War. In the late summer of 1632 the army of Swedish King Gustavus Adolphus had been besieged by Albrecht von Wallenstein at Nürnberg. The successes of Gustavus Adolphus over General Tilly forced Holy Roman Emperor Ferdinand II to recall Albrecht von Wallenstein into military service from retirement. Wallenstein was unmatched in his ability to raise troops within a few weeks and with fresh army he took to the field. The Imperial Army's ranks swelled as Wallenstein moved to trap the Swedes at their stronghold of Nürnberg. Repeatedly Gustav Adolf formed for battle and challenged Wallenstein to come out of his fortified camp, but he refused. As the supply situation worsened, the impetuous King attacked the Imperial camp