Military history of Spain Portugal and engage French forces on the frontiers while Spanish "guerrilleros" wore down the occupiers. Acting in concert, regular and irregular allied forces prevented Napoleon's marshals from subduing the rebellious Spanish provinces. The Spanish navy, put to sea in support of France during the War of the Third Coalition in 1805, suffered terrible losses at the Battle of Trafalgar, having been weakened by yellow fever in the preceding years; in many ways this marked the nadir of Spanish naval history. The events in mainland Spain had extensive consequences for her empire. Spain's colonies in the Americas had shown an increasing
Battle of Trafalgar employed elsewhere or had fallen from Napoleon's favour. Villeneuve had shown a distinct lack of enthusiasm for facing Nelson and the Royal Navy after the French defeat at the Battle of the Nile in 1798. Napoleon's naval plan in 1805 was for the French and Spanish fleets in the Mediterranean and Cádiz to break through the blockade and join forces in the Caribbean. They would then return, assist the fleet in Brest to emerge from the blockade, and together clear the English Channel of Royal Navy ships, ensuring a safe passage for the invasion barges. Early in 1805, Vice Admiral