[Soldier talking on the phone while reading a map with a comrade, Rio Segre, Aragón Front, near Fraga, Spain]

[Republicans at the last line of fire before the summit, Rio Segre, Aragón front, near Fraga, Spain]

[Republicans at the last line of fire before the summit, Rio Segre, Aragón front, near Fraga, Spain]

[Two loyalist soldiers leaning on a tree while listening to an officer give a pep talk, Andalusian front, Spain]

[Soldier talking on phone while reading a map next to comrade, Rio Segre, Aragón front, near Fraga, Spain]

[Two loyalist soldiers leaning on a tree while listening to an officer give a pep talk, Andalusian front, Spain]

[Asturian miners making hand grenades with dynamite by wrapping them in newspaper and tin cans, Oviedo, Spain]

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