structural:scholar_edition, stylistic:tone, linguistic:translation
Palatinate Campaign

By abandoning Frederick, the German princes hoped to restrict the dispute to Bohemia, but Maximilian's dynastic ambitions made this impossible. In the October 1619 Treaty of Munich, Ferdinand transferred the Palatinate's electoral vote to Bavaria, and allowed Maximilian to annex the Upper Palatinate. Many Protestant rulers had supported Ferdinand against Frederick because they objected to deposing the legally elected king of Bohemia. On the same grounds, they viewed Frederick's removal as an infringement of "German liberties", while for Catholics, it presented an opportunity to regain lands and properties lost since 1555. The combination destabilised large parts of the Empire.

At the same time, the strategic importance of the Spanish Road to their war in the Netherlands, and its proximity to the Palatinate, drew in the Spanish. When an army led by Córdoba occupied the Lower Palatinate in October 1619, James I responded to this attack on his son-in-law. English naval forces were sent to threaten Spanish possessions in the Americas and the Mediterranean, while James announced he would declare war if Spanish troops were not withdrawn by spring 1621. These actions were primarily designed to placate his opponents in Parliament, who considered his pro-Spanish policy a betrayal of the Protestant cause. However, Spanish chief minister Olivares correctly interpreted them as an invitation to open negotiations, and in return for an Anglo-Spanish alliance offered to restore Frederick to his Rhineland possessions.

Since Frederick's demand for full restitution of his lands and titles was incompatible with the Treaty of Munich, hopes of a negotiated peace quickly evaporated. Despite defeat in Bohemia, Frederick's allies included Georg Friedrich of Baden and Christian of Brunswick, while the Dutch provided him with military support after the Eighty Years' War restarted in April 1621 and his father-in-law James funded an army of mercenaries under Mansfeld. However, their failure to co-ordinate effectively led to a series of defeats by Spanish and Catholic League forces, including Wimpfen in May 1622 and Höchst in June. By November 1622, the Imperials controlled most of the Palatinate, apart from Frankenthal, which was held by a small English garrison under Sir Horace Vere. The remnants of Mansfeld's army took refuge in the Dutch Republic, as did Frederick, who spent most of his time in The Hague until his death in November 1632.

At a meeting of the Imperial Diet in February 1623, Ferdinand forced through provisions transferring Frederick's titles, lands, and electoral vote to Maximilian. He did so with support from the Catholic League, despite strong opposition from Protestant members, as well as the Spanish. The Palatinate was clearly lost; in March, James instructed Vere to surrender Frankenthal, while Tilly's victory over Christian of Brunswick at Stadtlohn in August completed military operations. However, Spanish and Dutch involvement in the campaign was a significant step in internationalising the war, while Frederick's removal meant other Protestant princes began discussing armed resistance to preserve their own rights and territories.