[Boy with a cap of one of the metal battalions of the Union de Hermanos Proletarios (Union of Proletarian Brothers), Madrid]

[Republican militiaman saying farwell before the departure of a troop train for the front, Barcelona]

[Women and children saying farwell to Republican militiamen before the departure of a troop train for the front, Barcelona]

[Republican militiaman aiming a rifle, Barcelona or its vicinity]

[Republican militiawoman aiming rifle, Aragón front, Spain]

[Republican soldiers with artillery, Monte Aragón, east of Huesca, Spain]

[Republican soldiers lying on the ground aiming rifles, Santa Eulalia, Aragón front, Spain]

[Member of the International Brigades engaged in house-to-house fighting around the slaughterhouses near the University City, Madrid]