Covert Operations and Official Collaboration: British Intelligence's Dual Approach to Ireland during World War II

Abstract

Neutral Ireland posed a unique challenge to the wartime British intelligence community and the latter responded by adopting a dual approach. On the one hand, it carried out covert intelligence operations in Irish territory, involving the Service intelligence branches, the Ministry of Information, and, most importantly, the Secret Intelligence Service (SIS). On the other hand, unprecedented cooperation developed between military, police and intelligence agencies from Britain and Ireland, and in particular between MI5 and Irish military intelligence (G2). For most of the war British intelligence pursued this joint strategy of covert activity and official collaboration, and MI5 and SIS shared responsibility for Ireland. However, there was a gradual shift of emphasis towards cooperation and it was eventually concluded that the MI5-G2 link could serve all Britain's security needs. This article charts this evolution and places it within the context of Anglo-Irish wartime political relations.