[Members of the International Brigades with gun, looking out a window, in or around University City, Madrid]

[André Malraux (left) and Ilya Ehrenburg (center) at the Second International Congress of Writers for the Defense of Culture, Valencia]

[Member of the International Brigades helping a wounded comrade in the vicinity of the slaughterhouses near the University City, Madrid]

[Group of women and children living on the platforms of subway stations in the aftermath of Nationalist air raids, Madrid]

[Group of women and children living on the platforms of subway stations in the aftermath of Nationalist air raids, Madrid]

[Two Republican soldiers aiming gun out a window of the Medical School building, University City, Madrid]

"No pasaran!" ("They will not get through!") Inhabitants of Madrid building barricades against approaching Nationalist troops