Dashed left edge = started before May 1635 ·
Dashed right edge = ongoing beyond May 1635
Events in May 1635 3
1635France declares war on SpainFrench entry turns the Thirty Years' War into open Franco-Spanish conflictOn 19 May 1635 France formally declared war on Spain, abandoning its earlier policy of funding the Habsburgs' enemies from behind the scenes. The declaration opened a direct Franco-Spanish front alongside the broader Thirty Years' War and committed French troops to campaigns in the Low Countries, Italy, and the Rhineland. The conflict between the two powers continued for over two decades.
1635Battle of AveinFrench and Dutch forces defeat a Spanish army in the Spanish NetherlandsOn 20 May 1635, combined French and Dutch forces defeated a Spanish army near Avein in the Spanish Netherlands, one of the first major engagements after France entered the Thirty Years' War. The victory let the allied army advance on Leuven, though a subsequent siege there failed. It marked the new direct military confrontation between France and Spain.
1635Treaty of Prague signedSaxony and the Emperor make peace within the Thirty Years' WarHoly Roman Emperor Ferdinand II and Elector John George I of Saxony signed the Treaty of Prague on 30 May 1635, suspending the Edict of Restitution and uniting most Protestant German states with the Emperor against foreign intervention. The treaty failed to end the wider war, as France and Sweden continued fighting the Habsburgs. It marked a shift of the Thirty Years' War from a religious struggle toward a dynastic and political one.