Oxenstiern proved himself worthy to be the successor of Gustavus. He vigorously renewed alliances with the German princes, and endeavored to follow out the able plans sketched by the departed monarch. Wallenstein, humiliated by his defeat, had fallen back into Bohemia, and now, with moderation strangely inconsistent with his previous career, urged the emperor to conciliate the Protestants by publishing a decree of general amnesty, and by proposing peace on favorable terms. But the iron will of Ferdinand was inflexible. In heart, exulting that his most formidable foe was removed, he resolved with unrelenting vigor to prosecute the war. The storm of battle raged anew; and to the surprise of Ferdinand, Oxenstiern moved forward with strides of victory as signal as those of his illustrious predecessor. Wallenstein meanly attempted to throw the blame of the disaster at Lutzen upon the alleged cowardice of his officers. Seventeen of them he hanged, and consigned fifty others to infamy by inscribing their names upon the gallows. So haughty a man could not but have many enemies at court. They combined, and easily persuaded Ferdinand, who had also been insulted by his arrogance, again to degrade him. Wallenstein, informed of their machinations, endeavored to rally the army to a mutiny in his favor. Ferdinand, alarmed by this intelligence, which even threatened his own dethronement, immediately dismissed Wallenstein from the command, and dispatched officers from Vienna to seize his person, dead or alive. This roused Wallenstein to desperation. Having secured the cooeperation of his leading officers, he dispatched envoys to the Swedish camp, offering to surrender important fortresses to Oxenstiern, and to join him against the emperor. It was an atrocious act of treason, and so marvellous in its aspect, that Oxenstiern regarded it as mere duplicity on the part of Wallenstein, intended to lead him into a trap. He therefore dismissed the envoy, rejecting the offer. His officers now abandoned him, and Gallas, who was appointed as his successor, took command of the army. With a few devoted adherents, and one regiment of troops, he took refuge in the strong fortress of Egra, hoping to maintain himself there until he could enter into some arrangement with the Swedes. The officers around him, whom he had elevated and enriched by his iniquitous bounty, entered into a conspiracy to purchase the favor of the emperor by the assassination of their doomed general. It was a very difficult enterprise, and one which exposed the conspirators to the most imminent peril.