Among the princes of the Leipzig Confederation, the Elector of Saxony and the Landgrave of Hesse were the most powerful; and, until they were disarmed, the universal authority of the Emperor was unconfirmed. Against the Landgrave, therefore, Tilly first directed his attack, and marched straight from Magdeburg into Thuringia. During this march, the territories of Saxe Ernest and Schwartzburg were laid waste, and Frankenhausen plundered before the very eyes of Tilly, and laid in ashes with impunity. The unfortunate peasant paid dear for his master's attachment to the interests of Sweden. Erfurt, the key of Saxony and Franconia, was threatened with a siege, but redeemed itself by a voluntary contribution of money and provisions. From thence, Tilly despatched his emissaries to the Landgrave, demanding of him the immediate disbanding of his army, a renunciation of the league of Leipzig, the reception of imperial garrisons into his territories and fortresses, with the necessary contributions, and the declaration of friendship or hostility. Such was the treatment which a prince of the Empire was compelled to submit to from a servant of the Emperor. But these extravagant demands acquired a formidable weight from the power which supported them; and the dreadful fate of Magdeburg, still fresh in the memory of the Landgrave, tended still farther to enforce them. Admirable, therefore, was the intrepidity of the Landgrave's answer: "To admit foreign troops into his capital and fortresses, the Landgrave is not disposed; his troops he requires for his own purposes; as for an attack, he can defend himself. If General Tilly wants money or provisions, let him go to Munich, where there is plenty of both." The irruption of two bodies of imperial troops into Hesse Cassel was the immediate result of this spirited reply, but the Landgrave gave them so warm a reception that they could effect nothing; and just as Tilly was preparing to follow with his whole army, to punish the unfortunate country for the firmness of its sovereign, the movements of the King of Sweden recalled him to another quarter. Gustavus Adolphus had learned the fall of Magdeburg with deep regret; and the demand now made by the Elector, George William, in terms of their agreement, for the restoration of Spandau, greatly increased this feeling. The loss of Magdeburg had rather augmented than lessened the reasons which made the possession of this fortress so desirable; and the nearer became the necessity of a decisive battle between himself and Tilly, the more unwilling he felt to abandon the only place which, in the event of a defeat, could ensure him a refuge. After a vain endeavour, by entreaties and representations, to bring over the Elector to his views, whose coldness and lukewarmness daily increased, he gave orders to his general to evacuate Spandau, but at the same time declared to the Elector that he would henceforth regard him as an enemy.