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Ireland WWII Neutrality and the Allies

Core thesis

Ireland (Éire) under Éamon de Valera was officially neutral for the whole war, a policy called “The Emergency.” In public the state observed neutrality with almost pedantic rigor. In private it tilted heavily toward the Allies: weather data, a coded coastal navigation grid, an open border for volunteers, intelligence cooperation, quiet release of Allied airmen, and fire brigades for Belfast. Both Irelands were real at once, and de Valera insisted on maintaining both. Historians call it “benevolent” or “certain-consideration” neutrality.

1. The framework: neutral on paper, tilted in practice

Ireland had been independent only since 1922 and won full control of its foreign policy with the 1937 Constitution. For de Valera, neutrality was less about the moral equivalence of the belligerents than about proving the young state could set its own course independent of Britain. The public posture was scrupulous even-handedness; the private substance bent consistently toward the Allies. Nearly every item below flows from that gap.

2. The stone EIRE signs and their hidden numbers

In 1939 Ireland set up a Coast Watching Service and manned a chain of Look Out Posts (LOPs) roughly ten miles apart around the whole coast. Eventually 83 posts were established, numbered sequentially: LOP 1 at Ballagan Point, Co. Louth, up to LOP 82 at Inishowen Head, Co. Donegal (LOP 83 was out of sequence, at Dingle). In 1942–43 the watchers built huge stone signs beside their posts spelling ÉIRE — roughly 12 by 6 metres, using up to 150 tons of whitewashed stone set in concrete — ostensibly to warn aircraft they were over neutral territory.

The un-neutral part: a navigation grid for one side only

At the request of the American government (reportedly urged by U.S. minister David Gray), the identifying number of each LOP was added to its EIRE sign, turning the signs into air navigation marks. Air charts marking the positions and numbers were given first to Allied ferry pilots flying in across the Atlantic, and later to operational pilots — and were not provided to the Germans. A pilot coming in off the Atlantic could read a number off the ground, check his chart, fix his position, and follow the “Donegal Corridor” into the airfields of Northern Ireland.
Sources: Derry Journal; Coast Monkey; Visit Inishowen; eiremarkings.org (see References §A).

3. The Blacksod weather report and D-Day

Despite formal neutrality, Ireland covertly shared meteorological data with the Allies throughout the war — and the single most consequential weather reading of the war came from a post office in Co. Mayo.

The forecast that moved D-Day

Maureen Flavin (later Sweeney), sub-postmistress at Blacksod on the far western tip of Mayo, sent observations from the station in the post office; neutral Ireland allowed these to be passed to Britain. On the night of 2–3 June 1944 she reported a rapidly falling barometer and a force-six wind — an incoming Atlantic storm. Forwarded to Allied HQ in southern England, the report prompted an unusual callback (made at the direction of Eisenhower’s chief meteorologist, Group Captain James Stagg) asking her to confirm the figures. On that basis Eisenhower postponed the invasion by 24 hours, from 5 June to 6 June, avoiding a storm that would likely have wrecked the landings. She learned the significance only years later; the U.S. Congress recognized her role in 2021.
Sources: RTÉ Culture; Royal Meteorological Society; BBC; Wikipedia (see References §B).

4. Irishmen serving with the Allies

Tens of thousands of citizens of the neutral South served in British forces — commonly estimated at 60,000–70,000, alongside larger numbers from Northern Ireland. Motives ranged from family tradition and anti-fascist conviction to adventure and economic necessity, but a striking thread was that almost all insisted on their Irish identity, and many actually supported neutrality even while enlisting. The government quietly declined to obstruct volunteers so long as recruitment stayed out of the public eye and did not compromise neutrality.

The deserters and the “starvation order”

The Irish Defence Forces had grown to about 42,000. Just over 7,000 personnel deserted to join Allied forces (a desertion rate above 10 percent, with no parallel among other neutrals). About 2,500 returned and were court-martialed. The remaining ~5,000 were dealt with collectively: the Emergency Powers Order of 1945 imposed automatic dismissal, stripping pay and allowances and barring them from any government job or state assistance, including pensions — down to postman or garbage collector. Affected families called it a “starvation order.” In 2013 the Irish parliament passed legislation pardoning the men (mostly posthumously) and granting amnesty; the Defence Minister noted that had Germany invaded Britain, Ireland was next.
Sources: Royal Irish Virtual Military Gallery; The Irish Story; History Ireland; BBC; AP via Washington Examiner (see References §C).

5. Internment: the asymmetry at the Curragh

Belligerent servicemen who came down on Irish soil were interned at the Curragh camp — but treatment was quietly lopsided. German airmen were held for the duration; Allied airmen were increasingly released across the border into Northern Ireland, especially where a flight could be classified as non-operational (training, ferrying, patrol). By the later war years the Allied side of the camp had largely emptied while the German internees remained. Same policy on paper, very different outcome.

6. Intelligence cooperation and German spies

Irish military intelligence (G2), under Colonel Dan Bryan, worked closely and secretly with British MI5. German agents dropped into Ireland were almost uniformly ineffective and were rounded up — the best known, Hermann Görtz, parachuted in during 1940 and spent about eighteen months at large before capture. Ireland progressively neutralized the German legation’s ability to spy, pressuring minister Eduard Hempel into surrendering his radio transmitter as D-Day approached.

This fed the American Note of February 1944, when the U.S. (backed by Britain) demanded Ireland expel the Axis diplomats before the invasion. De Valera refused — expelling accredited diplomats would have breached the neutrality he had staked everything on — but the espionage risk had already been contained by other means.

7. The Treaty Ports and Churchill

Under the 1921 Anglo-Irish Treaty, Britain kept three deep-water “Treaty Ports” — Berehaven, Cobh (Queenstown), and Lough Swilly — useful for escorting Atlantic convoys. Chamberlain handed them back to Ireland in 1938. When war came, de Valera flatly refused to let Britain use them, and this became one of the sharpest frictions of the war. Churchill regarded the loss as painful in the Battle of the Atlantic, resented it bitterly, and at moments contemplated seizing the ports by force. So “Ireland closing the ports to Britain” really means de Valera denying use of ports Ireland had only just regained — the hardest, most consequential expression of genuine neutrality, and the one the Allies most resented.

The tension surfaced publicly at war’s end: Churchill used his VE-Day broadcast to rebuke Irish neutrality and the ports issue, and de Valera answered with a famously measured radio reply, widely admired in Ireland for its restraint.

8. Where neutrality bent toward Britain: the Belfast Blitz

When the Luftwaffe devastated Belfast in April–May 1941, de Valera sent fire brigades north across the border from Dublin, Dún Laoghaire, Drogheda, and Dundalk to help fight the fires — a striking breach of the neutral posture, justified on the grounds that the victims “are our people.” A clear sign that Irish neutrality was never emotionally neutral.

9. German bombs on Ireland

Ireland was bombed by the Luftwaffe, apparently by navigational error. The worst was the North Strand bombing of Dublin on 31 May 1941, which killed around 28 people; bombs on Campile, Co. Wexford, in 1940 had killed three. Germany apologized and paid compensation. A lingering theory holds that the North Strand raid was a deliberate reprisal for the Belfast fire-brigade gesture, but the accidental-navigation explanation is more widely accepted.

10. Rhetoric and censorship

Public discourse was tightly muzzled. Frank Aiken ran a censorship regime that suppressed strong commentary in either direction to protect neutrality — meaning Irish newspapers could not editorialize against Nazi Germany and, more troublingly, that news of Nazi atrocities and the emerging Holocaust was heavily filtered and downplayed. Even at the very end, the Irish Times was blocked by the censor from running a Reuters report about an Irish diplomat mourning Hitler in Lisbon. There was a genuine strand of anti-British nationalist sentiment, and a fringe of IRA figures actively sought German help (Seán Russell died aboard a U-boat returning to Ireland in 1940; schemes like “Plan Kathleen” came to nothing), but mainstream Irish opinion was not pro-Nazi, and the effective tilt of the state was toward the Allies.

11. Nazi thinking about Ireland

Germany drew up Operation Green (Unternehmen Grün), a contingency plan to invade Ireland in 1940 — but it was conceived largely as a companion feint to Operation Sea Lion against Britain, not a serious standalone campaign. Hitler and the high command treated Ireland as strategically peripheral; hopes of exploiting Irish anti-British feeling never produced anything of value. The Abwehr’s spy efforts were a string of failures, and Berlin maintained correct-but-constrained relations through Hempel, whom de Valera valued precisely because he behaved with restraint.

12. Jews and immigration

The least defensible part of the record. Ireland refused to accept Jewish refugees from continental Europe in meaningful numbers. The Department of Justice ran a restrictive, at times overtly antisemitic, immigration policy, shaped partly by economic protectionism and partly by prejudice. Charles Bewley, Ireland’s envoy in Berlin in the 1930s, was notably pro-Nazi and antisemitic and obstructed visa applications. Only a few dozen Jewish refugees were admitted during the war years; postwar reluctance persisted, though a group of roughly a hundred Jewish orphans was admitted to Clonyn Castle in 1948.

De Valera personally is more complicated: the 1937 Constitution he authored explicitly recognized the Jewish congregations of Ireland, he was regarded as sympathetic to the small Irish Jewish community, and a forest in Israel is named for him. But the state’s actual immigration policy was a moral failure, and sympathy at the top did little to change it.

13. The condolences on Hitler’s death

The act that fixed Ireland’s wartime reputation in many minds. Hitler died on 30 April 1945.

2 May 1945: de Valera calls on the German minister

On 2 May, de Valera addressed the Dáil in the morning, then travelled that evening to Hempel’s private home in Dún Laoghaire to express condolences on Hitler’s death, accompanied by Joseph Walshe, secretary of External Affairs. Both Walshe and his deputy Frederick Boland had tried to deter him, warning of the damage to a reputation already low because of neutrality. The popular memory of a “book of condolences” is a myth — no such book existed; de Valera simply called on the minister in person. He was not entirely alone: President Douglas Hyde sent his secretary to the German envoy on 3 May, and Irish envoys elsewhere made similar calls.

De Valera’s defense was strictly proceduralist: so long as Ireland kept diplomatic relations with Germany, failing to call would have been (in his words) an act of unpardonable discourtesy to the German nation and to Hempel, whose wartime conduct he considered irreproachable. He had called at the U.S. legation two weeks earlier to condole on Roosevelt’s death and refused to draw a distinction in protocol. But the timing — days after Germany’s collapse, as the scale of the death camps was becoming known — meant the gesture landed as a moral catastrophe and drew a storm of protest at home and abroad. As historian Dermot Keogh put it, that single act, not his substantively pro-Allied record, fixed his place in many people’s memory.
Sources: RTÉ analysis; Irish Times; History Ireland (Keogh); RTÉ Archives (see References §D).

14. The through-line

The tension between two Irelands of 1939–45: the public one that observed neutrality with almost pedantic rigor (denying the ports, refusing to expel Axis diplomats, condoling on Hitler’s death) and the private one that gave the Allies weather forecasts, a coded navigation grid, an open border for volunteers, quiet intelligence cooperation, released airmen, and fire brigades for Belfast. De Valera insisted on maintaining both at once — which is why his record is still argued over eighty years on.

References

Note on sourcing

Sections 2, 3, 4, and 13 were verified against the web sources listed below (§A–D). Sections 1, 5–12, and 14 are drawn from general historical knowledge; authoritative further reading for those is listed in §E. Web URLs are given in full for copy-paste.

A. EIRE signs / Coast Watching Service

B. Blacksod weather report and D-Day

C. Volunteers and deserters

D. Condolences on Hitler’s death

  • Clair Wills, That Neutral Island: A Cultural History of Ireland During the Second World War (2007).
  • Robert Fisk, In Time of War: Ireland, Ulster and the Price of Neutrality, 1939–45 (1983) — strong on the Treaty Ports and Churchill.
  • Dermot Keogh, Ireland and Europe 1919–1948 and his work on Ireland and the Jewish refugee question.
  • Bryce Evans, Ireland during the Second World War: Farewell to Plato’s Cave (2014).
  • Eunan O’Halpin, Spying on Ireland: British Intelligence and Irish Neutrality during the Second World War (2008) — G2, MI5, and the German spies.
  • Michael Kennedy, Guarding Neutral Ireland (2008) — the Coast Watching Service and LOPs.