O'Halpin, Eunan. "According to the Irish Minister in Rome: British Decrypts and Irish Diplomacy in the Second World War." Irish Studies in International Affairs 6 (1995): 95-105.
O'Halpin, Eunan. "Army, Politics and Society in Independent Ireland, 1923-1945." Historical Studies (Irish Conference of Historians) 8 (1993): 158-174.
O'Halpin, Eunan. "Aspects of Intelligence [The Emergency, 1939-45]." Irish Sword 19 (1993-1994): 57-65.
Royal Historical Society Database: "Special number, '"The Emergency", 1939-45', being proceedings of a conference organized by the Military History Society of Ireland, in association with the Military Archives, at Cathal Brugha Barracks, Dublin, 18-20 June 1992."
O'Halpin, Eunan. "British Intelligence, the Republican Movement and the IRA's German Links, 1935-45." In Republicanism in Modern Ireland, ed. Fearghal McGarry, 108-131. Dublin: University College Dublin, 2003.
O'Halpin, Eunan. "Intelligence and Security in Ireland, 1922-45." Intelligence and National Security 5, no. 1 (Jan. 1990): 50-83.
From 1923 to 1938, Ireland's "security priorities were overwhelmingly domestic." As war approached, however, "a new, elaborate and pervasive security system" was required. Security and intelligence cooperation with Britain "was surprisingly extensive at administrative levels even before the war."
O'Halpin, Eunan. "Irish-Allied Security Relations and the 'American Note' Crisis: New Evidence from British Records." Irish Studies in International Affairs 11 (2000).
O'Halpin, Eunan. "Irish Neutrality in the Second World War." In European Neutrals and Non-Belligerents during the Second World War, ed. Neville Wylie, 283-303. Cambridge: Cambridge University Press, 2001.
O'Halpin, Eunan. "MI5's Irish Memories: Fresh Light on the Origins and Rationale of Anglo-Irish Security Liaison in the Second World War." In Ireland and the Second World War: Politics, Society and Remembrance, eds. Brian Girvin and Geoffrey Roberts, 133-150. Dublin: Four Courts, 2000.
O'Halpin, Eunan. Spying on Ireland: British Intelligence and Irish Neutrality during the Second World War. Oxford: Oxford University Press, 2008.
Peake, Studies 54.3 (Sep. 2010) and Intelligencer 18.1 (Fall-Winter 2010), notes that the author studies "the intelligence relationship between [Irish] G-2 and [British] MI5-MI6," and explains, "in considerable detail, how it fit the political realities of wartime Ireland." This "is a very valuable contribution to the history of WWII intelligence." For White and Riley, Irish Studies in International Affairs 19 (2008), O'Halpin "highlights the intelligence cooperation between Ireland and Britain during the war" and emphasizes "the assistance the Irish government provided to the Allies."
O'Halpin, Eunan. "'Toys' and 'Whispers' in '16-land': SOE and Ireland, 1940-1942." Intelligence and National Security 15, no. 4 (Winter 2000): 1-18.
SOE plans for a stay-behind operation in Ireland, as well for a rumor-planting campaign, ran afoul of both MI5 and MI6 -- and of Churchill's reluctance to provide arms to the Irish.
O'Halpin, Eunan, ed. MI5 and Ireland, 1939-1945: The Official History. London: Frank Cass, 2002. Dublin: Irish Academic Press, 2003.
Doerries, JIH 9.1 & 2 (Summer 2010), notes that "[t]he 'Official History' presented in this highly interesting volume is, in fact, the history of the Irish Section [BIH] of MI5. The document ... was produced between the autumn of 1944 and the early days of 1946.... Eunan O'Halpin provides an excellent introduction for the contemporary historian as well as for future researchers possibly less informed on the internal makings of British intelligence in the 20th century.... [M]uch of this 'Note on the Work' is about: the fruitful cooperation of Irish and British intelligence [against the Germans] during World War II."
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