[Two women sitting on a bench, kids playing on the ground, Place de Catalan, Barcelona, Spain]

[Republican soldiers firing machine guns, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers running with spools of wire, Rio Segre, Aragón front, near Fraga, Spain]

[Loyalist officer standing on a barrel giving a pep talk to loyalist soldiers, Andalusian front, Spain]

[Volunteer members of International Brigade sitting in a large barrel against a tree, a gun outside, Spain]

[Collage of two prints of explosion in the mountainside, Rio Segre, Aragón front, near Fraga, Spain]

[The battalion's political commissar and commander, Rio Segre, Aragón front, near Fraga, Spain]

[The battalion's political commissar and commander, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldier carrying a wounded soldier, Rio Segre, Aragón front, near Fraga, Spain]

[Andre Marty and Hans Kahle talking at a farewell ceremony for the International Brigades, near Falset, Spain]

[Republican soldiers making a command call, Río Segre, Aragón front, near Fraga, Spain]

[Republican soldiers helping comrade on stretcher, Río Segre, Aragón front, near Fraga, Spain]

[Republican soldiers helping wounded comrades, Rio Segre, Aragón front, near Fraga, Spain]

[Discussion and telephone call to army command, Rio Segre, Aragón front, near Fraga, Spain]

[Soldiers walking on a hill, preparing for battle, Rio Segre, Aragón front, near Fraga, Spain]

[Volunteer members of International Brigade sitting in a large barrel against a tree, a gun outside, Spain]

[Republican soldier combing his hair and looking into a hand-held mirror, Battle of Brunete, Spain]

[Loyalist militiamen jumping over a gully carrying rifles, near Espejo, Córdoba front, Spain]

[Woman holding a child fleeing Nationalist bombings, near Cerro Muriano, Córdoba front, Spain]

[Woman holding a child fleeing Nationalist bombings, near Cerro Muriano, Córdoba front, Spain]

[Republican soldiers during the battle for this strategically located hilltop town, Teruel, Aragón front, Spain]

[Republican soldiers preparing a telephone wire, Río Segre, Aragón front, near Fraga, Spain]

[Republican soldiers firing machine guns, Rio Segre, Aragón front, near Fraga, Spain]

[Refugees in train windows, police officer in foreground, Spain-France border, near Cerbère, France]