In 1936, the rebellion of monarchists and fascists led by General Franco, in alliance with Hitler and Mussolini, mobilized anti-fascists all over the world, among them Robert Capa. During the entire period of the war, Capa traveled throughout the Loyalist-held areas of Spain photographing battles, cities under siege and the chaos of a modern nation at war with itself. One series of images documents the heroic Loyalist defense of Madrid; another the mass exodus of Catalonians from Barcelona to th...