This paper will explore the evidence on migration rates and attitudes towards emigrants in revolutionary Ireland, broadly defined as the 1912-1922 period, and in the immediate aftermath of independence. What can we know about who left? What were their motivations? Who was classed as an emigrant, and who was simply returning to their "homeland" of mainland Britain as independence was established? Exploring this issue reveals that attitudes towards citizenship and identity largely influenced who was regarded as an emigrant to Britain and who was regarded as a returning migrant as the architecture of the British state was dismantled in the post-1922 era. This, it seems, had little to do with place of birth and everything to do with political outlook. Theories of emigration will be explored, alongside historian's ideas on the stifling social and political effect of the First World War's limitation on migration which may have helped to create a cohort of revolutionary citizens who might otherwise have left. Finally, nationalist attitudes towards economic migrants as "traitors" to the country in its hour of need during the War of Independence are critically examined, tracing the legacy of these sentiments in later decades within Irish political debates on emigrants, particularly those going to Britain.