Peninsular War

Battle context

The Peninsular War (1808–1814) engaged Spain, Portugal, and the United Kingdom against French imperial forces in the Iberian Peninsula, forming one of the major sustained fronts of the Napoleonic Wars. The conflict overlapped with the War of the Fifth Coalition in 1809 and the War of the Sixth Coalition from 1812 to 1814, making it a continuous drain on French military and administrative resources across multiple coalition struggles. In Spain the war is considered coextensive with the Spanish War of Independence, reflecting its dual character as both an imperial contest and a national resistance. Spanish casualties reached into the hundreds of thousands, underscoring the war's devastating toll on the peninsula's population. The theater tied down substantial French forces that Napoleon required elsewhere, contributing to the broader erosion of French strategic capacity during the final years of the empire.