Tilly, from whom this bold step on the part of the Landgrave was not long concealed, despatched Count Fugger with several regiments against him; and at the same time endeavoured to excite his subjects to rebellion by inflammatory letters. But these made as little impression as his troops, which subsequently failed him so decidedly at the battle of Breitenfield. The Estates of Hesse could not for a moment hesitate between their oppressor and their protector.
But the imperial general was far more disturbed by the equivocal conduct of the Elector of Saxony, who, in defiance of the imperial prohibition, continued his preparations, and adhered to the confederation of Leipzig. At this conjuncture, when the proximity of the King of Sweden made a decisive battle ere long inevitable, it appeared extremely dangerous to leave Saxony in arms, and ready in a moment to declare for the enemy. Tilly had just received a reinforcement of 25,000 veteran troops under Furstenberg, and, confident in his strength, he hoped either to disarm the Elector by the mere terror of his arrival, or at least to conquer him with little difficulty. Before quitting his camp at Wolmerstadt, he commanded the Elector, by a special messenger, to open his territories to the imperial troops; either to disband his own, or to join them to the imperial army; and to assist, in conjunction with himself, in driving the King of Sweden out of Germany. While he reminded him that, of all the German states, Saxony had hitherto been most respected, he threatened it, in case of refusal, with the most destructive ravages.
But Tilly had chosen an unfavourable moment for so imperious a requisition. The ill-treatment of his religious and political confederates, the destruction of Magdeburg, the excesses of the Imperialists in Lusatia, all combined to incense the Elector against the Emperor. The approach, too, of Gustavus Adolphus, (however slender his claims were to the protection of that prince,) tended to fortify his resolution. He accordingly forbade the quartering of the imperial soldiers in his territories, and announced his firm determination to persist in his warlike preparations. However surprised he should be, he added, "to see an imperial army on its march against his territories, when that army had enough to do in watching the operations of the King of Sweden, nevertheless he did not expect, instead of the promised and well merited rewards, to be repaid with ingratitude and the ruin of his country." To Tilly's deputies, who were entertained in a princely style, he gave a still plainer answer on the occasion. "Gentlemen," said he, "I perceive that the Saxon confectionery, which has been so long kept back, is at length to be set upon the table. But as it is usual to mix with it nuts and garnish of all kinds, take care of your teeth."
Tilly instantly broke up his camp, and, with the most frightful devastation, advanced upon Halle; from this place he renewed his demands on the Elector, in a tone still more urgent and threatening. The previous policy of this prince, both from his own inclination, and the persuasions of his corrupt ministers had been to promote the interests of the Emperor, even at the expense of his own sacred obligations, and but very little tact had hitherto kept him inactive. All this but renders more astonishing the infatuation of the Emperor or his ministers in abandoning, at so critical a moment, the policy they had hitherto adopted, and by extreme measures, incensing a prince so easily led. Was this the very object which Tilly had in view? Was it his purpose to convert an equivocal friend into an open enemy, and thus to relieve himself from the necessity of that indulgence in the treatment of this prince, which the secret instructions of the Emperor had hitherto imposed upon him? Or was it the Emperor's wish, by driving the Elector to open hostilities, to get quit of his obligations to him, and so cleverly to break off at once the difficulty of a reckoning? In either case, we must be equally surprised at the daring presumption of Tilly, who hesitated not, in presence of one formidable enemy, to provoke another; and at his negligence in permitting, without opposition, the union of the two.
The Saxon Elector, rendered desperate by the entrance of Tilly into his territories, threw himself, though not without a violent struggle, under the protection of Sweden.
Immediately after dismissing Tilly's first embassy, he had despatched his field-marshal Arnheim in all haste to the camp of Gustavus, to solicit the prompt assistance of that monarch whom he had so long neglected. The king concealed the inward satisfaction he felt at this long wished for result. "I am sorry for the Elector," said he, with dissembled coldness, to the ambassador; "had he heeded my repeated remonstrances, his country would never have seen the face of an enemy, and Magdeburg would not have fallen. Now, when necessity leaves him no alternative, he has recourse to my assistance. But tell him, that I cannot, for the sake of the Elector of Saxony, ruin my own cause, and that of my confederates. What pledge have I for the sincerity of a prince whose minister is in the pay of Austria, and who will abandon me as soon as the Emperor flatters him, and withdraws his troops from his frontiers? Tilly, it is true, has received a strong reinforcement; but this shall not prevent me from meeting him with confidence, as soon as I have covered my rear."
The Saxon minister could make no other reply to these reproaches, than that it was best to bury the past in oblivion.
He pressed the king to name the conditions, on which he would afford assistance to Saxony, and offered to guarantee their acceptance. "I require," said Gustavus, "that the Elector shall cede to me the fortress of Wittenberg, deliver to me his eldest sons as hostages, furnish my troops with three months' pay, and deliver up to me the traitors among his ministry."
"Not Wittenberg alone," said the Elector, when he received this answer, and hurried back his minister to the Swedish camp, "not Wittenberg alone, but Torgau, and all Saxony, shall be open to him; my whole family shall be his hostages, and if that is insufficient, I will place myself in his hands. Return and inform him I am ready to deliver to him any traitors he shall name, to furnish his army with the money he requires, and to venture my life and fortune in the good cause."
The king had only desired to test the sincerity of the Elector's new sentiments. Convinced of it, he now retracted these harsh demands. "The distrust," said he, "which was shown to myself when advancing to the relief of Magdeburg, had naturally excited mine; the Elector's present confidence demands a return. I am satisfied, provided he grants my army one month's pay, and even for this advance I hope to indemnify him."