In addition to the global spread of the conflict, the Great War brought a further innovation: from the summer of 1914, the conflict on the Western Front became a war of position and attrition with the excavation of thousands of miles of trenches. Trench warfare also prevailed on the Italian front . On other fronts, such as Eastern Europe, the trench warfare could not be diffused because of the length of the front.
AAVV, La Grande Guerra illustrata, Georg Stilke, Berlino, s. d.
AAVV, La guerre. Documents de la section photographique de l’Armée, Librairie Armand Colin, Parigi, 1916
AAVV, Großer Bilderatlas des Weltkrieges, Bruckmann, Monaco, 1915