These two kings vied with each other for the honour of defending Lower Saxony, and of opposing the formidable power of Austria. Each offered to raise a well-disciplined army, and to lead it in person. His victorious campaigns against Moscow and Poland gave weight to the promises of the King of Sweden. The shores of the Baltic were full of the name of Gustavus. But the fame of his rival excited the envy of the Danish monarch; and the more success he promised himself in this campaign, the less disposed was he to show any favour to his envied neighbour. Both laid their conditions and plans before the English ministry, and Christian IV. finally succeeded in outbidding his rival. Gustavus Adolphus, for his own security, had demanded the cession of some places of strength in Germany, where he himself had no territories, to afford, in case of need, a place of refuge for his troops. Christian IV. possessed Holstein and Jutland, through which, in the event of a defeat, he could always secure a retreat. Eager to get the start of his competitor, the King of Denmark hastened to take the field. Appointed generalissimo of the circle of Lower Saxony, he soon had an army of 60,000 men in motion; the administrator of Magdeburg, and the Dukes of Brunswick and Mecklenburgh, entered into an alliance with him. Encouraged by the hope of assistance from England, and the possession of so large a force, he flattered himself he should be able to terminate the war in a single campaign. At Vienna, it was officially notified that the only object of these preparations was the protection of the circle, and the maintenance of peace. But the negociations with Holland, England, and even France, the extraordinary exertions of the circle, and the raising of so formidable an army, seemed to have something more in view than defensive operations, and to contemplate nothing less than the complete restoration of the Elector Palatine, and the humiliation of the dreaded power of Austria. After negociations, exhortations, commands, and threats had in vain been employed by the Emperor in order to induce the King of Denmark and the circle of Lower Saxony to lay down their arms, hostilities commenced, and Lower Germany became the theatre of war. Count Tilly, marching along the left bank of the Weser, made himself master of all the passes as far as Minden. After an unsuccessful attack on Nieuburg, he crossed the river and overran the principality of Calemberg, in which he quartered his troops. The king conducted his operations on the right bank of the river, and spread his forces over the territories of Brunswick, but having weakened his main body by too powerful detachments, he could not engage in any enterprise of importance. Aware of his opponent's superiority, he avoided a decisive action as anxiously as the general of the League sought it.