Arguments about the Irish Union provided an unprecedented opportunity for the exploitation of the print medium in shaping public opinion. Pamphlets became the principal weapons in a struggle for ideological advantage. Parliamentary speeches, satirical poems, earnest exhortations? even an account of the millennium, streamed from the booksellers. But, as this study shows, the conflict raged well beyond the environs of Dublin’s parliament, involving provincial and metropolitan agencies in the three kingdoms. McCormack’s annotated finding list brings together details of close on 300 items, and provides call numbers locating copies in the major libraries of the British Isles.