What country did Spain engage in a long series of military conflicts?

Spain engaged in a long series of military conflicts with France, particularly during the Napoleonic Wars in the early 19th century. The Peninsular War (1808-1814) was a significant conflict where Spain, along with Britain and Portugal, fought against Napoleonic France's occupation. This period was marked by guerrilla warfare and significant social and political upheaval in Spain. The conflicts had lasting effects on both countries and contributed to the decline of Spanish power in Europe.