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

[Refugee on the road fleeing a Nationalist air raid, near Cerro Muriano, Spain]

[Member of the International Brigades, Madrid]

[Republican soldier rolling cigarette, Madrid]

[Members of the International Brigades defending a building in the University City, Madrid]

[Republian soldier crouching by table, Madrid]

[U.S. military observer Evans Fordyce Carlson lighting a pipe, China]

[Interior of building destroyed by Nationalist air raids, Madrid]

[Older woman and child on the platform of a subway station in the aftermath of Nationalist air raids, Madrid]

[Republican soldier defying tradition by helping women do laundry for the troops, Madrid]

[German members of the International Brigades, Madrid]

[Soldiers playing chess behind the Republican lines, Madrid]

[Refugees from Málaga, Murcia, Spain]

[Republican soldier with body on a stretcher during the battle of Mount Solluve, Bilbao front, Spain]

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

[Farewell ceremony for the International Brigades, Les Masies, Spain]

[Soldiers marching along the Grand Canal, Tai'erzhuang, Xuzhou front, China]

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

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

[Republican machine gunners hitting the retreating army, Rio Segre, Aragón front, near Fraga, Spain]

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

[Man, with women and baby, preparing for mobilization as General Franco's troops approached the city, Barcelona]

[Young girl at refugee transit center, Barcelona]

[Refugee family on a cart on the road from Tarragona to Barcelona]