The whole force of Bavaria and the League was now at the disposal of the Emperor to be employed against the Bohemians, who by the pacification of Ulm were abandoned to their fate. With a rapid movement, and before a rumour of the proceedings at Ulm could reach there, Maximilian appeared in Upper Austria, when the Estates, surprised and unprepared for an enemy, purchased the Emperor's pardon by an immediate and unconditional submission. In Lower Austria, the duke formed a junction with the troops from the Low Countries under Bucquoi, and without loss of time the united Imperial and Bavarian forces, amounting to 50,000 men, entered Bohemia. All the Bohemian troops, which were dispersed over Lower Austria and Moravia, were driven before them; every town which attempted resistance was quickly taken by storm; others, terrified by the report of the punishment inflicted on these, voluntarily opened their gates; nothing in short interrupted the impetuous career of Maximilian. The Bohemian army, commanded by the brave Prince Christian of Anhalt, retreated to the neighbourhood of Prague; where, under the walls of the city, Maximilian offered him battle. The wretched condition in which he hoped to surprise the insurgents, justified the rapidity of the duke's movements, and secured him the victory. Frederick's army did not amount to 30,000 men. Eight thousand of these were furnished by the Prince of Anhalt; 10,000 were Hungarians, whom Bethlen Gabor had despatched to his assistance. An inroad of the Elector of Saxony upon Lusatia, had cut off all succours from that country, and from Silesia; the pacification of Austria put an end to all his expectations from that quarter; Bethlen Gabor, his most powerful ally, remained inactive in Transylvania; the Union had betrayed his cause to the Emperor. Nothing remained to him but his Bohemians; and they were without goodwill to his cause, and without unity and courage. The Bohemian magnates were indignant that German generals should be put over their heads; Count Mansfeld remained in Pilsen, at a distance from the camp, to avoid the mortification of serving under Anhalt and Hohenlohe. The soldiers, in want of necessaries, became dispirited; and the little discipline that was observed, gave occasion to bitter complaints from the peasantry. It was in vain that Frederick made his appearance in the camp, in the hope of reviving the courage of the soldiers by his presence, and of kindling the emulation of the nobles by his example.