With Gustavus Adolphus and his Swedish Alliance now deep within the Holy Roman Empire, Count Tilly decided that defense was no good against such a formidable foe. Tilly joined armies with Maximilian’s army and attacked Bamberg, and cleared the region of Protestant power. This action sprang Gustavus Adolphus into life. He quickly regained power in Bamberg, and then moved on Bavaria, a key Catholic power center.
Tilly, who went on the offensive, was now on the run from an embittered Gustavus Adolphus. When Tilly’s army reached the city of Rain on the Lech River, he set up defense-works for the ensuing battle. On April 15, 1632, Adolphus crossed the Lech River covered by intense cannon fire. Tilly could not halt any Swedish advance, because of the heavy casualties inflicted by the Swedish cannons. Tilly himself was a victim as he was fatally wounded during the bombardment. After crossing the river, and with Imperial forces in chaos due to Tilly’s hasty removal from injury, Swedish Cavalry ran roughshod over the Catholics. Maximilian was now in danger, and had to flee his own duchy when Gustavus Adolphus invaded by May 1632.
Maximilian was left without a choice, his top general was killed, and his remaining forces were in chaos; Wallenstein needed to be quickly recalled. Within a few weeks of Maximilian’s flight, Wallenstein came back to power after immense demands. He wanted complete control of 70,000 troops and negotiation decisions without answering to Maximilian in any way. All of his terms being granted, Wallenstein recaptured Prague and ridded Bohemia of any invading force. After these objectives were completed, Wallenstein moved to join his army to what was left of Maximilian’s troops in order to advance en masse on Adolphus. Adolphus realized what was taking place and tried to prevent the maneuver, but failed. Distraught, Adolphus had to take a defensive stance against Wallenstein in Nuremburg. Wallenstein, who seemed to have the upper hand would not attack Adolphus; he chose rather to cut Adolphus’ supply lines, and starve him into submission.
With little success on either side, both armies left their positions and moved northward by September 1632. Adolphus attacked Upper Austria, hoping to lure Wallenstein into open conflict. He refused. Instead, Wallenstein tried a similar maneuver when he attacked Saxony, Adolphus’ powerful ally. Wallenstein was successful, and Adolphus marched to defend his ally. The Swedish Army arrived by November 1632 to confront the Catholics. Wallenstein rightly perceiving that he had the upper hand in position and numbers, chose to attack Adolphus near Leipzig at Lutzen. A foolish decision, however, gave Adolphus a small window of opportunity, ultimately leading to Wallenstein’s defeat. A Swedish victory, though earned, was not celebrated, because the great Swedish King, Gustavus Adolphus was killed during the course of battle.
The Thirty Years’ War, already a complex diplomatic maze, became even more so after Adolphus’ death. Sweden and the Protestants were now without a leader. The Swedish heir was a six-year-old girl, hardly what the Swedes and Protestants were used to under Adolphus. Without the strong imposition-minded Adolphus, Sweden and certainly the Protestants were now in serious danger. Negotiations ensued with hopes that France would become more proactive. France did help to create the Heilbronn League, and used French power to guarantee Swedish military payment. Payment, however, did not arrive and the remaining Swedish Army mutinied. To make matters worse Adolphus’ duplicitous ally, Saxony, would not agree to the Heilbronn League terms. Saxony actually went so far as to dissuade members from joining the League, and negotiated separately with Wallenstein. Eventually, Saxon Elector Johann-Georg did join campaigns against Emperor Ferdinand, but demanded that the military be under former Bohemian rebel Matthias Thurn’s direction.
At this juncture, Wallenstein shockingly negotiated a cease-fire with his former Lieutenant, von Arnim, who was now serving the Saxons. Wallenstein was lying. He broke the cease-fire only a few weeks later when his army invaded Saxony. Yet, an army did not stop his advance, the plague did. Another cease-fire was hastily agreed, which again only lasted a short while before Wallenstein again attacked with great success. He captured Thurn and 8,000 Swedish soldiers, then moved to the Oder River taking all of Lusatia. He was setting up a plan to invade Brandenburg and Saxony. Seeing new events unfold, Spain also sent a force to reopen the “Spanish Road” into The Netherlands. The remaining Swedish army moved against the Spanish and Bavarians, taking Regensburg rather easily. Maximilian and Ferdinand were livid when cries to Wallenstein for help were unheeded. Once again, Catholic Electors and the Emperor distrusted Wallenstein. He was granted too much power as the Imperial Court panicked after Breitenfeld.
With Imperial demands that Wallenstein move his army into Bavaria also dismissed, Ferdinand had enough. He sent ambassadors to remove Wallenstein from power. Wallenstein, cocky, asked his officers to swear an oath of allegiance to him instead of the Emperor. Officers did swear to Wallenstein, but another clause was added to their oaths, that they’d follow him as long as he was under Ferdinand’s command. Wallenstein’s power quickly worked against him, as his chief officers fled camp and proclaimed him an outlaw. Wallenstein fled with his remaining loyalists to Eger to join von Arnim’s army against the Emperor. A banquet was held in Wallenstein’s army at which the loyalists were murdered, and Wallenstein was stabbed to death. Upheaval throughout Europe saw Saxony and Brandenburg forsake the Protestant Heibronn League, Spain gain more power, and the Swedish force wiped out. France alarmed at Spanish and Austrian Habsburg power suddenly increasing, could no longer sit by idle. Cardinal Richelieu soon brought French armies into the Thirty Years’ War beginning in 1635.