With the same promptness with which he had brought his brother-in-law of Brandenburg to terms, Gustavus forced the hand of the Elector of Saxony, who now overcame his scruples and sent him the needed reinforcements. An imperial army of forty thousand men, under the command of an Italian adventurer named Torquato Conti, had been sent against him, immediately on his landing in Pomerania, but no battle had been fought, and beyond laying waste the country the Imperialists had so far accomplished nothing. The emperor, who had predicted that "the Snow-king would melt under the rays of the Imperial sun," became alarmed at his successes and selected Tilly to stay his southward advance. This able and experienced general promptly assumed the command of the forces of the Catholic League, and in order to strike terror into the hearts of the Protestant princes, sacked and pillaged the city of Magdeburg in Lower Saxony, giving it over without restraint to devastation and ruin by the brutal soldiery. The horrors which were here enacted beggar description, and leave a hideous stain upon the page of history. Tilly himself, in announcing his success to the emperor, wrote: "Since the destruction of Troy and Jerusalem never has such a siege been seen." Gustavus had, indeed, come too late to relieve Magdeburg, but the report of the unspeakable atrocities which that unhappy city had witnessed, fired his generous heart with wrath and an eager determination to punish a general so devoid of humanity. And the opportunity was soon to present itself. Advancing rapidly into Saxony, he met Tilly on the plains of Breitenfeld, near Leipsic, September 7, 1631; and not only defeated him, but utterly annihilated his army, scattering it like dust before the storm. He was now, until a new army could be raised, master of all Germany. Nothing apparently could have hindered him from marching on Vienna and dictating to the emperor his own terms of peace. It has been and is yet a matter of speculation, why Gustavus did not relentlessly follow up the results of this great victory, instead of going into winter quarters and affording Ferdinand and the discomfited princes of the League a chance of recovering from their utter demoralization. The answer is, no doubt, that he did not feel himself strong enough to lay siege to Vienna, without covering his rear and securing his base of supplies. He had always, like the good general he was, been careful to keep open a possible line of retreat. For the moment he was indeed irresistible. At Merseburg two thousand Imperialists were cut to pieces. Cities opened their gates to receive him. The Protestant population, in their ecstacy at his victories, were ready to worship him as a demigod. Proceeding southward to Nuremberg and Munich, he was met again by Tilly at the river Lech, where a brief battle was fought; Gustavus was again victorious and Tilly lost his life. This feat of crossing the Lech in