This very vivid memoir describes the prison experiences of a Cork Fenian activist, John Sarsfield Casey. 'The Galtee Boy' was a name used by Casey when he sent letters for publication to newspapers, one of which was used against him at his trial in 1865. His memoir was written after he had returned from deportation and describes the period from his arrest in 1865, his trial in Cork and conditions in Mountjoy, Millbank, Pentonville and Portland prisons. His memoir is the most extensive surviving account from the Fenian side of the experiences of those prisoners detained in Cork. Biographies of people mentioned in the memoir are given in an appendix.