[Spanish girl embracing volunteer during farewell parade for the International Brigades, Barcelona, Spain]

[Spanish girl embracing volunteer during farewell parade for the International Brigades, Barcelona, Spain]

[Man, woman, and child fleeing Nationalist bombing, Cerro Muriano, Córdoba front, Spain]

[Members of the Abraham Lincoln Brigade, farewell ceremony for the International Brigades, Les Masies, Spain]

[Large crowd of soldiers during the farewell ceremony for the International Brigades, Les Masies, Spain]

[Republican soldiers preparing for battle, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldiers preparing for battle, Rio Segre, Aragon front, near Fraga, Spain]

[Marineros looking over a ledge, Rio Segre, Aragón Front, near Fraga, Spain]

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

[Republican soldiers resting in crevices, Rio Segre, Aragón Front, near Fraga, Spain]

[Republican soldiers descending mountain, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldiers crouching in grass, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldiers riding mules, Rio Segre, Aragón front, near Fraga, Spain]

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

[Republican soldier holding a rifle, Rio Segre, Aragón Front, near Fraga, Spain]

[Republican soldiers running uphill, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers running uphill, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers storming forward, Rio Segre, Aragón Front, near Fraga, Spain]

[Explosion in the distance during battle, Rio Segre, Aragón Front, near Fraga, Spain]

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

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

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

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

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