These conditions the duke was obliged to accept, but in the meantime his long hesitation and delay had caused the loss of Magdeburg, which after a gallant defence was stormed by the troops of Pappenheim and Tilly on the 10th of May. The ferocious Tilly had determined upon a deed which would, he believed, frighten Germany into submission; he ordered that no quarter should be given, and for five days the city was handed over to the troops. History has no record since the days of Attila of so frightful a massacre. Neither age nor sex was spared, and 30,000 men, women, and children were ruthlessly massacred. The result for a time justified the anticipations of the ferocious leader. The terrible deed sent a shudder of horror and terror through Protestant Germany. It seemed, too, as if the catastrophe might have been averted had the Swedes shown diligence and marched to the relief of the city; for in such a time men were not inclined to discuss how much of the blame rested upon the shoulders of the Duke of Brandenburg, who was, in fact, alone responsible for the delay of the Swedes. Many of the princes and free towns which had hitherto been staunch to the cause of Protestantism at once hastened to make their peace with the emperor. For a time the sack of Magdeburg greatly strengthened the Imperialist cause. No sooner did the news reach the ears of the Duke of Brandenburg than his fears overcame him, and he wrote to Gustavus withdrawing from the treaty he had made, and saying that as Spandau had only been delivered to him in order that he might march to the relief of Magdeburg he was now bound in honour to restore it. Gustavus at once ordered Spandau to be evacuated by his troops, and again marched with the army against Berlin, which he had but a few days before left. Here he again dictated terms, which the duke was forced to agree to. The Swedish army now marched to Old Brandenburg, thirty-four miles west of Berlin, and there remained for some time waiting until some expected reinforcements should reach it. The place was extremely unhealthy, and great numbers died from malaria and fever, thirty of Munro's musketeers dying in a single week. During this time the king was negotiating with the Elector of Saxony and the Landgrave of Hesse. These were the two most powerful of the Protestant princes in that part of Germany, and Tilly resolved to reduce them to obedience before the army of Gustavus was in a position to move forward, for at present his force was too small to enable him to take the field against the united armies of Tilly and Pappenheim.