[Republican militiamen in a trench, Aragón front, Spain]

[Republican militiamen firing over a barricade, near Barcelona, Spain]

[U.S. military observer Evans Fordyce Carlson smoking pipe with two men, China]

[Republican militiaman with gun behind barricade, near Huesca, Aragón front, Spain]

[Republican militiaman, near Huesca, Aragón front, Spain]

[Two Republican soldiers embracing, Aragón front, Spain]

[Republican soldiers crouching on the ground, Santa Eulalia, Aragón front, Spain]

[Three Loyalist militiamen in a gully aiming rifles, Córdoba front, Spain]