[Woman holding baby, man, and young girl along train track fleeing Nationalist bombings, near Cerro Muriano, Córdoba front, Spain]

[Woman and children fleeing the town, which had been bombed by Nationalist planes, near Cerro Muriano, Córdoba front, Spain]

[Republican soldier amid rubble, Spain]

[Member of the International Brigades behind a barricade, in or around University City, Madrid]

[Members of the International Brigades with guns behind a barricade, in or around University City, Madrid]

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

[Men of the International Brigades aiming gun out the window in a laboratory of the Medical School building of the University City, Madrid]

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

[Men of the International Brigades catapulting grenades in the vicinity of the slaughterhouses near the University City, Madrid]

[Republican soldiers, trenches, University City, Madrid]

[Soldiers in Republican bunkers around the Clinical Hospital, one of the principal bastions of the Nationalist rebels in the University City, Madrid]

[Woman standing amid rubble of buildings destroyed by Nationalist air raids, Madrid]

[People living on the platforms of subway stations in the aftermath of Nationalist air raids, Madrid]

[Refugees from the Nationalist air raids preparing to leave the city, Madrid]

[Three children outside bullet-riddled building following an air raid, 10 Peironcely Street, Madrid]

[Members of the International Brigades and the other Spanish Republican forces, Madrid]

[Group of Republican soldiers at rest, Madrid]

[Soldiers writing behind the Republican lines, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldier and woman during the battle of Mount Solluve, Bilbao front, Spain]

[Crowds running for shelter when the air-raid alarm sounded, Bilbao, Spain]

[Women running for shelter when the air-raid alarm sounded, Bilbao, Spain]

[Children huddled on sidewalk, Bilbao, Spain]

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

[Republican soldier killed while stringing telephone lines, Teruel, Aragón front, Spain]