With the Catholics and the Holy Roman Empire firmly in control, arrogant insolence showed during the diplomatic negotiations following Denmark’s defeat. Emperor Ferdinand II wanted a number of issues brought to pass, such as his son to be in line for the Emperor’s throne. To bring his demands to pass, Ferdinand had to make the electors happy, as well as outside nations, which included Spain and France. Ferdinand’s blunders began almost immediately after Christian IV of Denmark was defeated.
Mistakes abounded first when Denmark received most of her lost territory back, much to Wallenstein’s chagrin, at the Treaty of Lubeck. Denmark simply had to agree that it would not interfere within the Empire. Wallenstein voiced his opinion that such lax treaty terms would prove dangerous, and possibly could bring Sweden into the War. Next, Ferdinand at the behest of a number of his aids, produced the Edict of Restitution, which demanded all lost Catholic territory since the Reformation be returned to Catholic control. The Protestant Electors flatly refused both of Ferdinand’s demands. Catholic Electors also proved to be uneasy with Ferdinand’s growing power. In return for their votes, the Catholic’s wanted Wallenstein removed from army command. They also desired that the army, now large, and unimpeded, be shrunk by two-thirds. Wallenstein and his army were an immense burden on the Empire, as his army lived off of the land, and Wallenstein paid his men through plunder. Their brutality, though reasoned necessary , cost him his support. Ferdinand complied and relieved Wallenstein.
International demands were also made during the process after Denmark capitulated. Spain was aiding the Holy Roman Empire, and the H.R.E. was aiding Spain against the Dutch. When Spain further asked assistance against the Mantuan’s in Northern Italy, France cried foul. The French ambassadors impressed upon the Electors to reduce Imperial military power. When Ferdinand asked the Electors to send support to Spain, the Electors agreed with the French, and stood against Imperial involvement in Spain’s affairs. France was not yet done diplomatically. Spain gained the upper hand against Mantua, and sacked the city in 1630. France panicked and agreed to the Peace of Regensburg; however, Louis XIII would not sign. France was not to be at war, but did not have an army. French ambassadors sought to bring Sweden into an alliance against the Habsburgs of Spain and the Holy Roman Empire, but to do so, they had to negotiate peace between Poland and Sweden, who were involved in a separate war. Peace was agreed. With Poland pacified, Sweden mobilized to invade Germany.
Meanwhile, with Wallenstein dismissed, and the army shrunk, Count Tilly was installed as head of the army. He was not ready when Sweden landed in Pomerania. The Empire was uncertain how events would now unfold after such a meaningless few months of diplomacy ended. By the middle of 1630, Wallenstein, who had warned of impending Swedish belligerence, was proved correct. Gustavus Adolphus II, King of Sweden, brought his well trained and experienced army to Stettin, and forced Duke Bogislav XIV at gunpoint to sign a treaty. Bogislav wanted to remain neutral, but Adolphus would have none of it. Immediately, Adolphus proved much more successful than Christian IV or Waldstein during their previous campaigns. Even more amazing is how Adolphus accomplished his goals. He had no allies, but willed his way to power everywhere his army marched. Eventually, Adolphus did find what he craved, an ally with deep pockets – France.
The French, who were now eager to stand opposed to the Habsburgs, were not militarily able to fight, yet. Instead, once Sweden made intentions known by invading, France worked to diplomatically clear the way for Gustavus Adolphus. Adolphus assumed control of the Protestant cause, and France funded Adolphus’ outstanding army with the Treaty of Barwalde. Soon, France would be more directly involved, and Gustavus Adolphus would prove to be a rather successful thorn in the Holy Roman Empire’s flesh.