 About 5,000 Spaniards died in the Mauthausen concentration camp.After the official end of the war, guerrilla warfare was waged on an irregular basis by the Spanish Maquis well into the 1950s, gradually reduced by military defeats and scant support from the exhausted population.In 1944, a group of republican veterans, who also fought in the French resistance against the Nazis, invaded the Val d'Aran in northwest Catalonia, but were defeated after 10 days.