[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]

[Dead soldiers, Teruel, Aragón front, Spain]

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

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

[Spectators at the farewell parade for the disbanded International Brigades, Barcelona]

[Republican soldiers climbing up remains of bridge bombed by Nationalist rebels in an attempt to trap the Republicans, Rio Segre, Aragón front, near Fraga, Spain]

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

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