The political events of the decade of revolution in Donegal examined in this book are set firmly in the context of the underlying social and economic background. The experiences of the different regions in a disparate county are highlighted, as well as the conflicting loyalties of unionists, home rulers, and separatists. Religion and the shadow of partition loom large. The emergence of rival paramilitary groups of Irish and Ulster Volunteers in response to the home rule bill threatened to spill over into communal conflict. This was averted, at least temporarily, by the outbreak of the First World War which had a profound impact. The IRA campaign in Donegal began slowly but grew in intensity during 1920–1. The imposition of partition had a deep and abiding impact in Donegal, not least on the unionist community in border areas, and contributed to the bitterness and intensity of the split in the nationalist movement over the Treaty and of the Civil War which followed.