This is a major, collaborative study of organised military activity and its broad impact on Ireland over the last thousand years or so, from the middle of the first millennium AD to modern times. It integrates the best recent scholarship in military history into its social and political context to provide a comprehensive treatment of the Irish military experience. The eighteen chronologically-organised chapters are written by leading scholars each of whom is an authority on the period in question. Drawing the whole work together is a wide-ranging introductory essay on the 'Irish military tradition' which explores the relationship of Irish society and politics with militarism and military affairs. The text is illustrated throughout by over 120 pictures and maps.