In 1911, Italians living abroad constituted one-sixth of Italy’s population, numbering roughly five million people. However, the experiences of emigrant communities have not been incorporated into the narrative of Italy’s war. This chapter discusses the place of migration within the historiography of the First World War and of the war within migration history. It introduces the cohort of 300,000 emigrant soldiers who returned to Italy to complete their conscripted military service during the war, a mass mobilisation which was a uniquely Italian phenomenon. Scholars are divided as to whether this should be regarded as a success or a failure: I argue it is remarkable that so many made the journey considering that, in most locations, there were no coercive measures obliging them to do so. The chapter lays out the global micro-history approach adopted in the book and the decision to focus on four emigrant soldiers, each typical and atypical in different respects: Americo Orlando in São Paulo, Esterino Alessandro Tarasca in New York, Cesare Bianchi in London and Lazzaro Ponticelli in Paris.