[Republican soldier looking through peephole, University City, Madrid]

[Republican soldiers playing chess in the trenches, University City, Madrid]

[Wounded Republican soldiers carried by comrades, University City, Madrid]

[Republican soldiers firing machine gun, University City, Madrid]

[Wounded Republican soldier walking with the help of a comrade, University City, Madrid]

[Republican soldiers aiming rifles through a window, University City, Madrid]

[Republican soldiers firing machine guns, University City, Madrid]

[Republican soldiers playing chess in the trenches, University City, Madrid]