British Army intelligence in provincial Ireland, 1919‒1921: organisation, outcomes and the 6th Division blacklist

Intelligence played a critical role in the Irish War of Independence, though debate remains about the effectiveness of British information-gathering. Historians have focused largely on the intelligence war in Dublin. This article examines British Army intelligence in the 6th Division area (roughly the southern third of the island). It will contextualise British military intelligence before the conflict and traces the slow development of an intelligence organisation in the 6th Division. It then considers the sources and nature of British information gathering, particularly interrogation of prisoners and the collection and analysis of captured documents. Military intelligence summaries and a ‘Blacklist’ of I.R.A. suspects across the 6th Division are used to ascertain the quality of military intelligence products during the final stages of the conflict. The ‘Blacklist’ can be contrasted with I.R.A. unit arrest data and leadership lists, to assess the effectiveness of British military intelligence at a county level. This comparison provides a new measure of British performance, clearly revealing the limitations of British military intelligence in the 6th Division, particularly when compared to relatively more successful results achieved by crown forces in the Dublin District.