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Events on Saturday 19 May 1635 1
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.