Maximilian conducted the war as executor of the ban of the empire, and Tilly, who commanded the army of execution, was in the Bavarian service.
The Emperor owed superiority in the field to Bavaria and the League, and his fortunes were in their hands. This dependence on their goodwill, but ill accorded with the grand schemes, which the brilliant commencement of the war had led the imperial cabinet to form.
However active the League had shown itself in the Emperor's defence, while thereby it secured its own welfare, it could not be expected that it would enter as readily into his views of conquest. Or, if they still continued to lend their armies for that purpose, it was too much to be feared that they would share with the Emperor nothing but general odium, while they appropriated to themselves all advantages. A strong army under his own orders could alone free him from this debasing dependence upon Bavaria, and restore to him his former pre-eminence in Germany. But the war had already exhausted the imperial dominions, and they were unequal to the expense of such an armament. In these circumstances, nothing could be more welcome to the Emperor than the proposal with which one of his officers surprised him.
This was Count Wallenstein, an experienced officer, and the richest nobleman in Bohemia. From his earliest youth he had been in the service of the House of Austria, and several campaigns against the Turks, Venetians, Bohemians, Hungarians, and Transylvanians had established his reputation. He was present as colonel at the battle of Prague, and afterwards, as major-general, had defeated a Hungarian force in Moravia. The Emperor's gratitude was equal to his services, and a large share of the confiscated estates of the Bohemian insurgents was their reward. Possessed of immense property, excited by ambitious views, confident in his own good fortune, and still more encouraged by the existing state of circumstances, he offered, at his own expense and that of his friends, to raise and clothe an army for the Emperor, and even undertook the cost of maintaining it, if he were allowed to augment it to 50,000 men.
The project was universally ridiculed as the chimerical offspring of a visionary brain; but the offer was highly valuable, if its promises should be but partially fulfilled. Certain circles in Bohemia were assigned to him as depots, with authority to appoint his own officers.
In a few months he had 20,000 men under arms, with which, quitting the Austrian territories, he soon afterwards appeared on the frontiers of Lower Saxony with 30,000. The Emperor had lent this armament nothing but his name. The reputation of the general, the prospect of rapid promotion, and the hope of plunder, attracted to his standard adventurers from all quarters of Germany;and even sovereign princes, stimulated by the desire of glory or of gain, offered to raise regiments for the service of Austria.
Now, therefore, for the first time in this war, an imperial army appeared in Germany; -- an event which if it was menacing to the Protestants, was scarcely more acceptable to the Catholics. Wallenstein had orders to unite his army with the troops of the League, and in conjunction with the Bavarian general to attack the King of Denmark.
But long jealous of Tilly's fame, he showed no disposition to share with him the laurels of the campaign, or in the splendour of his rival's achievements to dim the lustre of his own. His plan of operations was to support the latter, but to act entirely independent of him.
As he had not resources, like Tilly, for supplying the wants of his army, he was obliged to march his troops into fertile countries which had not as yet suffered from war. Disobeying, therefore, the order to form a junction with the general of the League, he marched into the territories of Halberstadt and Magdeburg, and at Dessau made himself master of the Elbe. All the lands on either bank of this river were at his command, and from them he could either attack the King of Denmark in the rear, or, if prudent, enter the territories of that prince.
Christian IV. was fully aware of the danger of his situation between two such powerful armies. He had already been joined by the administrator of Halberstadt, who had lately returned from Holland; he now also acknowledged Mansfeld, whom previously he had refused to recognise, and supported him to the best of his ability. Mansfeld amply requited this service. He alone kept at bay the army of Wallenstein upon the Elbe, and prevented its junction with that of Tilly, and a combined attack on the King of Denmark. Notwithstanding the enemy's superiority, this intrepid general even approached the bridge of Dessau, and ventured to entrench himself in presence of the imperial lines.
But attacked in the rear by the whole force of the Imperialists, he was obliged to yield to superior numbers, and to abandon his post with the loss of 3,000 killed. After this defeat, Mansfeld withdrew into Brandenburg, where he soon recruited and reinforced his army;and suddenly turned into Silesia, with the view of marching from thence into Hungary; and, in conjunction with Bethlen Gabor, carrying the war into the heart of Austria. As the Austrian dominions in that quarter were entirely defenceless, Wallenstein received immediate orders to leave the King of Denmark, and if possible to intercept Mansfeld's progress through Silesia.
The diversion which this movement of Mansfeld had made in the plans of Wallenstein, enabled the king to detach a part of his force into Westphalia, to seize the bishoprics of Munster and Osnaburg.
To check this movement, Tilly suddenly moved from the Weser;but the operations of Duke Christian, who threatened the territories of the League with an inroad in the direction of Hesse, and to remove thither the seat of war, recalled him as rapidly from Westphalia.
