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
Naval regions and districts of the Kriegsmarine the sea defense zones became well tested when the Allies invaded western Europe, in particular at the battle of Normandy. Sea Defense zone forces also fought fiercely to avoid losing Germany's submarine bases in France, in one case holding out for several months under Allied siege before surrendering. Naval regions and districts of the Kriegsmarine Naval regions and districts were the official shore establishment of Nazi Germany's Kriegsmarine during World War II. The Kriegsmarine shore establishment was divided into four senior regional commands, who were in turn subordinated to the operational Navy Group commanders who commanded all sea and shore