[Republican soldiers sitting in trenches, Rio Segre, Aragón Front, near Fraga, Spain]

[Republican soldiers sitting on hillside, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers carrying a stretcher, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers sitting in trenches, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers sitting in trenches, Rio Segre, Aragón front, near Fraga, Spain]

[Robert Capa (left) and Hans Marchwitza (center), near Peñarroya, Córdoba front, Spain]

[Marineros sitting in caves and crevices, Rio Segre, Aragón front, near Fraga, Spain]

[Treating the wounded Republican soldiers, Rio Segre, Aragón front, near Fraga, Spain]

[Three girls and a woman sitting in the street against a wall covered with posters, Bilbao, Spain]

[Foreign soldiers with arms full of bouquets, farewell parade for the International Brigades, Barcelona, Spain]

[Republican officer on call to command, Rio Segre, Aragón front, near Fraga, Spain]

[Treating the wounded Republican soldiers, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers installing artillery, Rio Segre, Aragón Front, near Fraga, Spain]

[Republican soldiers working on railroad, Rio Segre, Aragón front, near Fraga, Spain]

[Sailor standing on boat tie-up on beach, Battleship Jaime I, Almería, Spain]

Child victims: Bodies gathered after the raids on Barcelona

[Republican soldiers riding in truck, Madrid]

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

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

[Republican soldiers crouching behind a car during the battle of Mount Solluve, Bilbao front, Spain]

[Republicans installing anti-aircraft artillery, Rio Segre, Aragón front, near Fraga, Spain]

[Inside one of the many fortresses intended to defend Minorca against any attack, Minorca, Spain]

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

[Marching soldiers, including Robert Jordan, in farewell ceremony for the International Brigades, near Falset, Spain]