Spain was an ally of Napoleon's First French Empire; however, defeat in the naval Battle of Trafalgar in October 1805, which had decimated Spain's navy, had removed the reason for alliance with France. Manuel Godoy, the favorite of King Charles IV of Spain, began to seek some form of escape. At the start of the War of the Fourth Coalition, which pitted the Kingdom of Prussia against Napoleon, Godoy issued a proclamation that was obviously aimed at France, even though it did not specify an enemy. After Napoleon's decisive victory at the Battle of Jena–Auerstedt, Godoy quickly withdrew the proclamation. However, it was too late to avert Napoleon's suspicions. Napoleon planned from that moment to deal with his inconstant ally at some future time. In the meantime, the Emperor forced Godoy and Charles IV into providing a division of Spanish troops to serve in northern Europe. The Division of the North spent the winter of 1807–1808 in Swedish Pomerania, Mecklenburg, and towns of the old Hanseatic League. Spanish troops marched into Denmark in early 1808.