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A Plan to Be Captured: How Three American Commandos Deceived Their Nazi Captors Before D-Day

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A Plan to Be Captured: How Three American Commandos Deceived Their Nazi Captors Before D-Day

In 1944, a covert U.S. operation known as Operation Sparrow was launched to deceive Nazi Germany into believing an Allied invasion would come from southeastern Europe, thereby diverting critical military forces away from Normandy. Three elite OSS operatives—Floremon Duke, Guy Nunn, and Alfred Suarez—were airdropped into Hungary, surrendered to Hungarian authorities, and then handed over to German intelligence under a carefully crafted ruse. The mission was initially British but was abandoned due to Soviet opposition and taken over by the Americans. The operatives, aware of the risks, were captured and subjected to brutal interrogation, including starvation and solitary confinement. Despite these conditions, they maintained a consistent deception strategy, gradually revealing details of a fictional southeastern invasion that aligned with real events like Tito’s offensive and Allied bombing raids. This misinformation convinced Hitler and German high command that the main attack would come from the southeast, leading to the diversion of nearly 100,000 troops—critical in ensuring D-Day’s success. The deception persisted for months, with German generals continuing to believe the invasion was coming from the east into 1944. The operation succeeded not only in military terms but also in preserving the lives of Hungarian Jews and enabling Hungary’s eventual switch to the Allied side. After liberation, the men continued contributing to Allied efforts: Duke led Greek war relief, Nunn became a labor activist, and Suarez received a medical discharge due to post-traumatic stress. The story remained classified due to Cold War secrecy and Soviet suppression of anti-Nazi intelligence, with key figures dying before public recognition. Operation Sparrow stands as a testament to how a small group of brave individuals, through psychological ingenuity and courage, played a pivotal role in shaping the outcome of World War II.

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You're listening to the Cyber Wire Network, powered by N2K. Welcome to SpyCast, the official podcast of the International Spy Museum. I'm your host, Sasha Ingber, and each week I take you into the shadows of espionage, intelligence, and covert operations across the globe. In the spring of 1944, three elite commandos parachuted into Hungary. The country was aligned with Nazi Germany, and these men were trying to be captured in what was meant to look like a failed operation. Their real mission was to help. Hungary switched to the Allied side. But three days later, Germany launched a preemptive invasion. The three men were captured by the Nazis, imprisoned and interrogated. They used it as a chance to fool Hitler into thinking an Allied invasion would come from southeastern Europe, drawing German troops away from Normandy ahead of D-Day. Author Jason Bell unravels this daring, an untold story in his new book, Operation Sparrow. Hey, Jason, welcome to SpyCast. Hey, thanks for having me on your show. So before this was Operation Sparrow, it was Operation Sandy. This was a British plan. Why did it ultimately fall to the Americans at the Office of Strategic Services? Well, Hungary had been approaching both the British and the Americans from 1940. So they had to do something about it. In 1942, to switch sides, they wanted to switch from the Axis to the Allies. They had a better relationship with the British at first. They knew more people there. And so Britain actually took the lead on this mission of accepting three SOEs, Special Operations Executive Commandos, into their country to help arrange the switch. The problem was that the Soviets found out about it. So the Soviets, the British, the Americans, the Canadians were all on the same team together. But the British, were innocently thinking that they could do things that would help to win the war effort. The Soviets, meanwhile, had designs on Southeastern Europe and nixed the plan at Moscow late 1943. They called in the British foreign minister, Anthony Eden, said, "You just need to stop what you're doing in Southeastern Europe." Anthony Eden had not known about the plan. So he immediately told the Soviets that, yeah, he would investigate this. The command came down. The Soviets had a plan from Britain that they had to nix the mission. And that's where the Americans picked it up. It really reminds me of Operation Mincemeat, when the Brits planted fake documents on a corpse to essentially deceive Hitler and have troops diverted from Sicily ahead of an Allied invasion. This was essentially the same plan. So using three living people rather than a corpse. Now, were the Brits sorry to lose this operation? And were the Allies sorry to lose the operation? And were the Americans glad to take it on? The Brits were jealous. They did not like that the Americans took this over. They wanted they wanted the glory and the honor. And in fact, they tried to slow down the mission at certain points. The basic architecture of this was thought through by Alan Dulles, who would go on to be the first civilian leader of the CIA in 1953. What exactly? Was the plan? The plan was that these three Americans would go into Hungary, be airdropped in the middle of the night, surrender to the nearest military authorities, and then be handed over to Hungarian military intelligence, who was in on the plan. So the frontline Hungarian soldiers did not know the Americans were the enemy. But the very top echelons of Hungarian military intelligence knew that Hungary wanted to get out of the war. So the Hungarians were going to bring these three Americans to meet the Supreme Hungarian Command, arrange a surrender. The three sparrows were going to fly two top Hungarian politicians out of the country to Allied territory to sign the surrender secretly so that the Germans did not find out about it. And then, meanwhile, the sparrows would be briefly handed over to German intelligence, where they were going to. What strongly imply that there was an invasion coming through southeastern Europe, letting German intelligence put two and two together based on the kind of reports that they would give. Then the Germans would hand over the Americans back to the Hungarians, who would hand them keys to a new intelligence headquarters just outside of Budapest, bought and paid for by Hungary. And then Hungary was going to fight Germany with Allied assistance. And before we get into the way. That the plan fell apart. Can you explain why these three men were called sparrows? The obvious reason is that OSS loved bird names. The reason that I suppose they might have said this is because sparrows use singing to intimidate and deceive their enemies. And that was the mission to fly into enemy territory and to sing for the Germans. So let's talk about who these sparrows were. There's Colonel Floremon Duke. There's Captain Guy Nunn. And then there's Major Alfred Suarez. They undertook major risks. Can you explain who they were for them to be chosen for this mission? And then what in particular each of them was set to do? Yeah. So Floremon Duke was the kind of American equivalent of aristocracy. So a Dartmouth grad. Wealthy. He had flown fighter planes for America during World War I. He had played for the New York Giants in the National Football League. Then he went to Madison Avenue and became a millionaire as the advertising director for the Time Publishing Empires and Newsweek and Fortune magazines. 1939, he volunteered for military service. He had a diplomatic background. He saw that World War II was coming. This was, of course, a couple of years before America's involvement. So he got in. So he got into the war effort at the ground floor. When the OSS was founded, he was quickly recruited into the organization and rose quickly to become the head of Southeastern Intelligence. So he was in charge of everything from Greece, Albania, Romania, Bulgaria, getting agents in, getting supplies in, airdrops, running spies. He was a board leader and he was a man of action. So he was very frustrated to have the job that he had. He did not want to be a leader. He did not want to be behind a desk in Washington, D.C., issuing orders. He wanted to be on the ground fighting the Nazis. So in 1943, he began requesting permission to be airdropped behind enemy lines. At first, OSS flatly refused. But by early 1944, circumstances had changed enough that they let him go into the country. So his job really was to take his advertising skills and to be selling an allusion to Hitler. So keeping. Keeping his Madison Avenue job, but in a wartime context, I should also say he and the rest of the Sparrows were physically imposing, good looking guys. They were picked for the mission in part because of their courage and their previous leadership and their athleticism, you know, big, tough guys. And I think a lot of that had to do with creating the right image for Hungary to show Hungary what Americans looked like and that the Hungarians could look at these people and really be confident that, you know, that the 25 or 30,000 American troops that they hope to have airdrop in would look something like these Sparrows did. Duke had been a case officer to an incredibly important German during the war. Yeah. Floremon Duke was the case officer to Admiral Wilhelm Canaris, who was the most important. Spy in Germany during World War Two. So he was the chief of the Germany's military intelligence. He despised Hitler. He approached the United States early on and offered to help help the allies win, at least in the West. And the allies were understandably extremely suspicious. They thought this could be a trick or a trap. So Duke and Canaris both spoke French. So this was a natural language they could communicate in. But by February of 1944, Hitler fired him. He fired Canaris, which freed up Duke for other kinds of duties like going behind enemy lines, the other two Sparrows. So Guy Nunn was an Occidental College graduate from Los Angeles. He spoke nine languages. He was a 200 pound former starter, a captain of his football team, trained in psychological warfare. And he was recruited by the OSS because of his connections to European labor. So these were people behind enemy lines, factory foreman, et cetera, who hated Hitler. And early in the war, before the allies could fly planes over enemy territory, this was an easy way to activate resistance networks. These were people who, by pushing the wrong button or by misplacing a tool, could severely. damage wartime German logistics. And how about Suarez? So Suarez was a New York City born, raised, trained operative. So he was an expert in demolitions and radio work. So he had fought Hitler and Franco in the 1930s in Spain. He was a guy with a short temper. He loved to fight and avenge his honor. So OSS had a list of targets, bridges to be blown up to destroy German logistics. And Suarez was going to be the guy who would lead that demolition effort, along with utilizing the Allies' newfangled spy tech to be able to communicate back with headquarters to let them know about what kind of supplies and advisors were needed to help the Hungarians fight the Germans. So they all had a key role to play in terms of. negotiations, in terms of sabotage. But if we think about the Geneva Convention, these are men who are not operating as soldiers, they're spies. So how high are the stakes for them as they're about to parachute into Hungary? Well, Hitler had a couple of years earlier signed the commando order. It was a secret order. He did not want the Allies to find out because he didn't want German officers to be able to do anything. So he did not want the Allies to begin getting killed. But the commando officer said that all of these commandos had to be executed immediately. The only exception was if they had intelligence that torture would reveal, and then they could be kept alive until they had spilled their secrets, and then they needed to be executed immediately. So what they volunteered for was about as close to a suicide mission as you can imagine. Very brave men to agree to this mission. And as you had mentioned, the plan was to help Hungary switch from the Axis side to the Allied powers. And its prime minister, Miklos Kale, he knew of this plan. And he was doing what I learned was called the Kale double step, where he was trying to appease the Nazis while also secretly working with the Americans and trying to protect Hungarian Jews. He had been appointed by Hungary's regent, Admiral Miklos Horthy, who was deliberately kept in the dark. That's exactly right. So Horthy had authorized the switch in the most general vague terms, but he wanted to be kept in the dark about all the details so that if Hitler ever confronted him, which happened on numerous occasions, he would be able to plausibly deny everything. Now, when the operation begins, it very quickly falls apart. Because as these men have parachuted into Hungary, three days later, there is an invasion by the Nazis. And Hitler had preemptively assembled this force. He had summoned Horthy. Where did he get the intelligence that maybe something was afoot? And what happened next? Well, Hitler had thousands of spies in Hungary. And we can tell based on what happened, that the spies that he had were not at the very inner circle of Hungarian planning. So Hitler knew that an American mission was coming in, but he didn't know where it was landing. He didn't know what their names were. He didn't know exactly what date it was coming in. And things had been garbled enough that he mistook three Americans coming in for three American airborne divisions coming in. Just a small mistake. So he thought he was defeating a force, or he was planning to defeat a force of maybe 25,000 Americans. So he sends in this overwhelming invasion force. Over 100,000 troops go into Hungary with all kinds of air power and armor power, because he thinks that this is going to be a major battle. Strangely enough, the American OSS, the Office of Strategic Services, knew in the abstract that Hitler knew about the mission, because they suspected a Hungarian officer named Otto von Hatz of being a spy. It turns out they were wrong about this. Otto von Hatz was loyal, but their mistake really helped save the underlying mission, because they began planning for this eventuality that the Germans knew that the Sparrows were coming. So now there are thousands of German troops in Hungary. How are things starting to change in terms of what Hungary is going to do and what the Sparrows need to do? So Hungarian intelligence hid the Sparrows from the Nazis for nine days so they could get their stories straight. And so this was a story that would both be internally consistent with the Sparrows, but also consistent with what the Hungarians would tell the Germans. So the story was the Americans were going to be airdropped into Yugoslavia to help Tito, who had just launched a major offensive operation in mid-March, which was also supposed to convince the Germans that that's where D-Day was coming from, that Tito was covering for this mission. So the idea was to say, well, we Hungarians had nothing to do with this. This was an accidental airdrop into our territory. We arrested these guys and the Americans would say the same things. So for these nine days, the Hungarians were giving the Americans the safe space to conduct extensive rehearsals. They turned it into theatrical rehearsals. Two of these guys would pretend to be Gestapo tough guys, threatening the other guy who would pretend to be the one being interrogated. So they could figure out what they would be saying at each stage of the interrogations. They can pretend to break and begin slowly to reveal more and more information. So they have nine days to figure out their story, and then they are eventually handed over to the Germans by the Hungarians who have now surrendered. And there are internal arguments over who gets to hold these men in custody, who gets to interrogate them. Can you talk about that? The Hungarians, of course, they've been working with the German intelligence over the years. And so they had a pretty good psychological profile of what people were like. And so they found an officer in the German military to hand the sparrows over to who was not a Nazi. So his name was Major Horst Kruger. He was somebody who respected the Geneva Conventions. He did not like Hitler. He did not like the Nazis. And so it looked like, as one of the most important things in the German history, the sparrows said they'd gotten away with it. They were interrogated by a really gentle officer who wrote down what they said, and then arranged the best ticket they were going to get in the war, which was to go to a POW camp run by the Luftwaffe, the German Air Force near Frankfurt. The commandant there had been a POW himself. He respected the Geneva Convention rules. So the three sparrows were on the bus to go to Frankfurt when the Gestapo came, having tortured by this point Hungarians and figured out who these Americans actually were and what they were involved in. And they pulled the Americans off the bus and brought them to Belgrade to begin a more intensive form and a less sympathetic form of interrogation. So at this point, how are they faring? And is the story evolving? Because as you mentioned, it is no longer in this friendly environment amongst a person who actually is aligned with them. So, yeah, the three Americans are brought to Belgrade. They're into one of the most horrific Gestapo prisons there were, and they were separated into solitary confinement. People were executed in front of them, really trying to scare these Americans into delivering what they knew. The Americans all independently stuck to the same script. So they were delivering the information in the same sequence. And it turns out the Gestapo decided, OK, you've told us everything. You're going to do it. Everything, everything lines up. You're not telling us anything new. They had the order to execute the Sparrows the next day. So this was April 1st, 1944. The German major who had previously interrogated them found out the Gestapo housed them, rushed to Belgrade, talked to the Gestapo guys who told them that the Americans were going to be executed the next day. And Major Horst Kruger then went to Duke, started screaming at Duke, saying, you've withheld information from us. How dare you? I need to get information from you. You're going to tell me right now or else. Brought Duke over to a map. Duke was confused about what was happening. Horst Kruger whispered that the Sparrows were going to be shot tomorrow and gave them a plan for how to save themselves. And the plan amounted to ramping up the deception. So moving it from letting the Gestapo interrogators put two and two together into thinking that an invasion could come from this direction to really suggesting that they knew details about how the invasion was going to happen. And then they were able to make it so that they knew that it was going to happen. And that was exploiting the only loophole there was under Hitler's commando order, that people could be kept alive if they had intelligence. So meanwhile, the Luftwaffe was making the argument, we need these guys alive in order to defeat D-Day. And then the German army eventually got involved in this as well, saying we need this information in order to stop D-Day. While the Gestapo kept on claiming there are prisoners, we need to shoot them under the commando order. When we come back, how the Sparrows, from behind bars, Fooled the Germans and what effect their lies had on the Allied victory. In the modern AI enterprise, adversaries no longer break in. They log in. As autonomous AI agents and machines gain privileged access, your risk is becoming invisible and legacy tools can't keep up. Introducing IDERA from Palo Alto Networks. IDERA is the next generation identity platform built for the scale of the AI workforce. It helps you discover hidden risks instantly, eliminate static privileges with just-in-time enforcement, and automate governance at machine speed. Secure every identity, human, machine, and agentic with IDERA by Palo Alto Networks. Visit paloaltonetworks.com slash I-D-I-R-A to get started. Now, what exactly were they saying? What was the strategy that they used that allowed their stories to appease the Nazis who were so desperate? To learn what the Allies were planning. So, Duke was just a real master of this. So, he knew how advertising worked and how psychology worked and how gamesmanship worked. So, he had a whole stratagem of letting the Germans think that they were slowly drawing the story out of him. The Allies had a southeastern invasion plan because that's where Churchill had wanted to invade in 1943. Eventually, the Allies got together and decided the logistics were too complicated. But Floremont knew. So, Duke, in his role as intelligence chief, knew exactly what a southeastern invasion would have looked like. He knew all the problematic geographical points, where the mountains were, where the ports were, etc. So, rather than just inventing this on the fly, he was able to selectively declassify the southeastern invasion plans in this coy, guarded way to let the Germans think that they were slowly drawing this out of him as they kept on applying more and more pressure. And there was also. A little bit of trickery around a New York Times report. They agreed that they would only be revealing information that they had read from the New York Times just before they had taken off on the mission. They were all up on the news. And the idea was that the German interrogators wouldn't have access to these newspapers at all. They'd just be writing down everything that the Sparrows said. Meanwhile, reports would slowly be trickling in from German agents abroad. And Duke's hope was that these would line up without the Germans noticing the mismatch in time. The top echelons of German intelligence would say, wow, these guys, everything that they're telling us is true. Therefore, we can trust them on the invasion plans as well. Right. Now we see it. It's been confirmed. So, Duke is able to slowly share details which convince the Germans about where the invasion will take place. And they're moving from prison to prison over a period of about 13 months. What is it like for them in this very grim moment? Do they start to question whether or not this is working and where it's all headed for them? Yeah. So, Duke knew when D-Day was supposed to happen, which initially was in May. At least initially, there was this idea among the Sparrows. That we need to basically keep this together for about two months. That it was made more psychologically bearable for them, knowing that eventually D-Day was going to happen. But the conditions were really horrific. So they were in prisons. They were being kept in perpetual solitary confinement for weeks at a time. No access to sunlight, to human conversation. They were basically being slowly starved to death. So their food each day was a piece of small piece of bread that was high. It was high in sawdust and a thin bowl of vegetable soup. This was a couple hundred calories a day. They're being systematically starved to death. They're being subject to mock executions. People or fellow prisoners are executed in front of them to scare them. So it was really horrible. But because of the time, the nine days that they had together to prepare during this whole period, they all stayed on the same script, even without knowing whether the other two guys and their team were alive or dead. So eventually they get transferred to the Kolditz Castle in Leipzig, Germany. This is a Renaissance palace where prisoners of war are kept essentially as bargaining chips for Hitler. Can you tell us more about what their existence is like once they get into this castle? Well, it was a huge shift to the positive for them. So the other. The other prisoners, they were mostly British and they were deeply depressed to be POWs. But meanwhile, the Sparrows were just as happy as could be in that situation because suddenly they were protected by the Geneva Convention for a while. They had adequate food. They could write letters home. They were able to play chess and do sports and have outside time. But meanwhile, they knew that their situation was precarious, that the SS was interested in massacring prisoners, sending people on. Death marches, and so this whole time in prison, they just kept on doing their intelligence work. So they were setting up intelligence networks with anti-Nazi German civilians in the town below to find out if the SS was planning on coming in to massacre them. And then they were game planning what to do, how to fight. So they were active both in leisure and recreation, but also in continuing to prepare a literal fight against the Nazis. They were able to leave the castle grounds and talk to people in the town. The prisoners would fake medical problems or dental problems. That was where they got their their key agent, a young German woman who worked in a dentist's office, who despised the Nazis, worked to set up the cold intelligence outfit with a sympathetic group of civilians in the town below, who despised the Nazis, who despised the Nazis, worked to set up the cold intelligence outfit with a sympathetic group of civilians in the town below, who despised the Nazis. So using codes where they would hang their clothes and things like this would let the prisoners know if the SS was on their way to massacre them. So the intelligence work continues and there are informants on the ground. Do these guys have any clue if they're being effective? During that period, Floremont Duke was able to talk to an Austrian guard who told them this was just before D-Day started. Do they immediately believe him, does he need to? sell the fact that this really is a POW camp? Well, the two American lead guards, they meet Guinan in the dark when he whistles to them and begins talking to them. And in fact, they accuse him of being a Nazi. They say, there's nobody in front of us. We know that there's only Germans in front of us. And there's this really tense negotiation after none has just been shot at. Again, how its explosions are going on around them. So this is an extremely high tension situation. Guinan says, why don't you just work your way around the wall and see me? And then he has his hands up in the air and a big grin on his face. So these two Americans remain extremely skeptical. They went into the castle, were immediately greeted by over a thousand prisoners who were slapping them on the back, cheering and crying. And these two American guys remained in a state of severe cognitive dissonance. So they kept their fingers on the trigger finger and really came close to shooting people, but eventually became convinced that this could not be a trick. The Nazis could not pull off something that complicated. To think that Americans themselves were so close to killing the sparrows and. other prisoners of war. It really is something. And eventually the Soviets are able to establish control over the castle. It's the Soviets, not the Americans. What happens to them once they leave, not just in those first days, but as time passes by? For a few precious days, the Americans were in charge. The American commander who came in, Dobson, demanded that the Germans. that the Germans produce a breakfast feast for the Americans and for the British prisoners and the French prisoners who were there. This was the first time the prisoners had eaten well in a long time. So then the Sparrows were flown to Oxford in England to recuperate, to get some pounds back on them. They were severely malnourished at this point. And then they went back to D.C. to continue their OSS work. So Flormond Duke was appointed to head the Greek war relief. And so the idea here was that millions of Greeks were in danger of starving to death. But Duke, because of his connections to the Greek underground, these were people he was getting explosives and arms to, to help save as part of bodyguard World War II. He also helped save at least hundreds of thousands of lives in the post-war period. Guy Neumann. Guy Neumann joined the prosecution team for the Nuremberg trials, where he constructed visible proof of the Nazis' crimes. And Alfred Suarez fairly quickly got a medical discharge. He was suffering from a severe case of what we would now call post-traumatic stress disorder. The whole time he was under Nazi captivity, he just desperately wanted to be fighting these guys. And it wasn't because he was worried about his own safety, but it was because he didn't want to get his two colleagues killed. So the army agreed to release him with an honorable discharge. And then he became an engineer once again. I've talked to his daughter beforehand. He'd been very outgoing. He kept to himself. He chained smoke. It certainly turned him into a different man than he would have been if he'd never been captured. You had mentioned that you spoke to one of the children. Did you speak to other family members? What did they say about these men, knowing that you had uncovered this story? This would be new information to them. Yeah. So the only living child of any of the Sparrows that I know of, at least, is Alfred Suarez's daughter. And she said that he never talked about it. So he didn't talk about his wartime experiences. You know, he was, you know, very keen that she get a good education and that she learned foreign languages. So I think, you know, what has helped save his own life during Nazi captivity was something he wanted to be able to gift his daughter so she could be resilient and be able to interact with other cultures. But yeah, like many World War II veterans, he didn't talk about it. Guy Nunn and Floremon Duke were a bit more forthcoming. Certain aspects of their mission remained classified, so they couldn't tell everything. But Guy Nunn became a labor activist. After the war, this was in a period when McCarthyism and the rest of it, scare tactics were being used, goons were being hired to break apart unions. You can find video of Nunn talking about the fight for organized labor. And once you know that he's somebody who survived the Gestapo and stood up for the Gestapo, you could see the same fire in his eyes, that there was no amount of intimidation that was going to make him back down from his cause of supporting American labor now. To what extent did the Sparrows lies divert Hitler's forces away from Normandy before D-Day invasion? How were you able to piece that together? So when D-Day hit, the Germans had nearly a million troops in southeastern Europe. There were millions more of their Axis partners there. Meanwhile, there were only 50,000 German troops guarding Normandy. On D-Day. But after D-Day, the Sparrow deception kept working. So for months afterwards, Hitler was convinced and remained convinced that Normandy was the diversion attack and that the real attack was going to be happening somewhere else. So he kept his troops in southeastern Europe. And this was crucial not only for D-Day's success, but for winning the overall war. So as late as August of 1944, German generals were saying we could still defeat this Western invasion if we could be moving troops to fight. But Hitler keeps overruling us. Hitler remained privately convinced that the Northwestern attack through Normandy was a faint and that the real attack was coming somewhere else. He finally only permitted these troops to be redistributed from the southeastern theater in the fall of 1944. And that was because of military necessity. They were worried about the Soviet army linking up and cutting the German army into two. And this was the only reason that he permitted the withdrawal of those troops. Even then, he remained convinced that the Allies were planning an attack in southeastern Europe. And this was the direct result of what the three Sparrows were saying when they were imprisoned. Absolutely. And I should say that this was a combined arms operation. So Sparrow was the human element. This was three men delivering the story up close. But at the same time, Tito was fighting an offensive in the southeast. There were heavy Allied bombing raids going on. And there were further commando missions going on led by British and Canadian commandos who were going into Hungary to keep up the pressure. So everything that the Sparrows were telling them was lining up with the explosions, with the troop movements on the ground. Their interrogation did have a purpose in the end. How did you come across this operation, if it hadn't ever been brought to light? I was researching my previous book, Cracking the Nazi Code, about the first British secret agent who warned against Hitler's plans for the Holocaust in 1939. I was tracing where his warnings went to. One of them went in the spring of 1939 to Francis Dayock, an American intelligence officer who was involved in Hungary. So Dayock was involved in these negotiations with Hungary that helped Sparrow happen. And that's when I first found about this mission that was designed to be captured by the Germans. And without even knowing any of the details yet about this, this was probably about a decade ago, I thought, gee, that needs a book to go in and be intentionally captured by the Germans. This is a remarkable story. Why do you think that this mission, which ultimately was a success, why has it been kept a secret for so long? Well, it was because Hungary fell into the Soviet sphere. So even before World War II ended, Allied intelligence agents began getting captured and executed by the Soviets in Southeastern Europe. And the same intelligence networks in Europe that were the anti-Nazi organizations that became the anti-Soviet operations. And so really, that was the reason for secrecy. The other part of this massive deception operation, the part that focused on France, that finally became declassified in the '70s, and it was celebrated. But when these things began to be declassified in the 1970s, of course, the Cold War was still going on. Hungarian pro-democracy activists were still struggling against the Soviets. And so it became more convenient just to sweep it under the rug. And by the time these things finally did become declassified, the principal people were dead. And, so there was no longer that living memory that made it into a public event. You've really shown how a very small group of people can have an an outsized impact. This is a fascinating story. Thank you so much for your time, Jason. Thank you, Sasha. It was a pleasure to be on your show. Thanks for listening to this episode of SpyCast. If you liked the episode, give us a follow on Apple, Spotify, or wherever you get your podcasts, and leave us a rating or review. It really helps. If you have any feedback or you want to hear about a particular topic, you can reach us by email at spycastatspymuseum.org. I'm your host, Sasha Ingber, and the show is brought to you by N2K Networks, Goat Rodeo, and the International Spy Museum in Washington, D.C.

Podcast Summary

Key Points:

  1. In 1944, three American OSS commandos—Floremon Duke, Guy Nunn, and Major Alfred Suarez—were airdropped into Hungary to deceive Nazi Germany into believing an Allied invasion would come from southeastern Europe.
  2. The mission, known as Operation Sparrow, was originally a British initiative to help Hungary switch from the Axis to the Allies, but was halted by Soviet interference and later taken over by the U.S. Office of Strategic Services.
  3. The commandos were deliberately captured and interrogated by the Nazis, using psychological deception and carefully constructed stories to mislead German intelligence about the true location of the Allied invasion.
  4. The deception relied on Duke’s expertise in psychological warfare and propaganda, including selectively revealing details of a fictitious southeastern invasion plan that aligned with real wartime events.
  5. The plan succeeded in diverting over 100,000 German troops away from Normandy, significantly contributing to the success of D-Day and the broader Allied victory.
  6. Despite brutal conditions, including starvation, solitary confinement, and mock executions, the men maintained their story and eventually helped establish underground resistance networks in Germany.
  7. Their intelligence work continued during captivity, with prisoners using coded signals and informants to monitor Nazi troop movements and warn of mass executions.
  8. The operation remained secret for decades due to Soviet suppression of anti-Nazi intelligence and the Cold War context, with key figures dying before public recognition.

Summary:

S. operation known as Operation Sparrow was launched to deceive Nazi Germany into believing an Allied invasion would come from southeastern Europe, thereby diverting critical military forces away from Normandy. Three elite OSS operatives—Floremon Duke, Guy Nunn, and Alfred Suarez—were airdropped into Hungary, surrendered to Hungarian authorities, and then handed over to German intelligence under a carefully crafted ruse.

The mission was initially British but was abandoned due to Soviet opposition and taken over by the Americans. The operatives, aware of the risks, were captured and subjected to brutal interrogation, including starvation and solitary confinement. Despite these conditions, they maintained a consistent deception strategy, gradually revealing details of a fictional southeastern invasion that aligned with real events like Tito’s offensive and Allied bombing raids.

This misinformation convinced Hitler and German high command that the main attack would come from the southeast, leading to the diversion of nearly 100,000 troops—critical in ensuring D-Day’s success. The deception persisted for months, with German generals continuing to believe the invasion was coming from the east into 1944. The operation succeeded not only in military terms but also in preserving the lives of Hungarian Jews and enabling Hungary’s eventual switch to the Allied side.

After liberation, the men continued contributing to Allied efforts: Duke led Greek war relief, Nunn became a labor activist, and Suarez received a medical discharge due to post-traumatic stress. The story remained classified due to Cold War secrecy and Soviet suppression of anti-Nazi intelligence, with key figures dying before public recognition. Operation Sparrow stands as a testament to how a small group of brave individuals, through psychological ingenuity and courage, played a pivotal role in shaping the outcome of World War II.

FAQs

Operation Sparrow was a secret Allied mission in 1944 to help Hungary switch from the Axis to the Allied side. The plan involved three American operatives being airdropped into Hungary to feign capture, deceive Nazi intelligence, and divert German troops away from Normandy ahead of D-Day.

The British initially planned the operation but were blocked by the Soviet Union, which opposed any Allied activity in Southeastern Europe. The Soviets nixed the mission at Moscow in late 1943, prompting the Americans to take over and continue the effort through the Office of Strategic Services (OSS).

The operatives, after being captured, were interrogated by German officials and gradually revealed detailed, fabricated intelligence about an Allied invasion in southeastern Europe. They used psychological tactics, such as slowly revealing information and referencing news reports, to convince Nazi leaders that the invasion was coming from that region.

Hungary’s Prime Minister Miklos Kállay and military intelligence were secretly aligned with the Allies. They hid the operatives for nine days, used them to arrange a surrender, and orchestrated the story that the Americans had been airdropped into Yugoslavia to help Tito, thereby misleading the Germans.

Yes. The deception was highly successful—by April 1944, nearly a million German troops were stationed in southeastern Europe, while only 50,000 guarded Normandy. This allowed the Allies to achieve a critical strategic advantage during D-Day and for months after.

They were held in harsh prison conditions, including solitary confinement, starvation, and mock executions. After being transferred to Kolditz Castle in Leipzig, they were protected by the Geneva Convention and used the time to build intelligence networks and plan resistance against the Nazis.

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