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...German wartime knowledge SOE or OSS secret operations. Both the SOE and the Special Operations Branch of the OSS ran hundreds of clandestine operations during the war, parachuting agents far behind enemy lines. Yet, SOE's discovery in 1944 of the German security services' infiltration of SOE's Holland agent network, together with the beginning of acrimonious postwar debates about SOE's failure in Holland, necessitated Gubbins' investigation into German records. (1)
OSS Washington forwarded Gubbins' request to the OSS London office, then in the process of consolidating its operational files with the war now over. The London office produced four captured documents that dealt with Allied special operations, but none of the items proved pertinent to Gubbins' specific inquiries. One of these documents, however, would have interested any of the clandestine services during the war had it been forwarded to their air operations personnel. The document indicated that German army intelligence had issued a secret directive on the British Special Air Service (SAS). (2) Although the directive consisted only of a general, two-page narrative on SAS tactics, it indicated German familiarity with a special piece of electronic equipment carried by SAS, SOE, and OSS teams--a compact radar navigation homing beacon which those groups had considered a closely held secret. The Allies nicknamed this radar set Eureka, a Greek term meaning, "I have found it."
Recently declassified OSS records show the regular employment of Eureka radar beacons in clandestine drop zone (DZ) operations. (3) Allied special operations groups--the SAS, SOE, and the OSS--relied upon portable Eureka sets in all theaters because the ground-based, pre-positioned radar beacons enabled Allied aircraft, equipped with the Rebecca counterpart, to locate agent and supply DZs far behind enemy lines. Yet, deploying the highly classified beacons in enemy territory held substantial risk because these sets, if captured, could be activated to lure unsuspecting airborne agents and commando teams to certain capture. Although OSS documentation discloses the training, employment, and extreme secrecy surrounding Eureka-Rebecca system, these records also reveal that Allied special operations commands neglected to weigh the possible consequences whenever agents lost Eureka sets either accidentally during nighttime airdrops, or directly to the enemy. (4) Furthermore, the postwar inquiries into SOE's Holland disaster confirmed what may have been suspected--yet not circulated throughout the special operations community--that as early as 1942 the Germans had captured and activated Eureka beacons in order to manipulate Allied DZs. Due to these gaps in operational security, Allied commands continued to issue Eureka beacons throughout the war without modifications that would limit their vulnerability to further enemy exploitation.
More than sixty years later, historical assessments of enemy technical countermeasures to Allied special operations tend to concentrate on German Funkspiele or "radio games," that often deceived Allied special operations headquarters through the playback of captured agent radio transmitters. This paper builds upon that premise and suggests that, in certain cases, German manipulation of the Allies' Eureka-Rebecca system could not only in theory produce an effective countermeasure, but could also compromise an important layer of Allied security and provide Berlin the initial, technical capability to infiltrate Allied special operations. German manipulation of Eureka-Rebecca could theoretically simulate special operations DZs to establish a trap for the capture of Allied personnel, and to help provide a foundation for the subsequent radio games whose devastating impact ended so many clandestine operations. (5)
Early Compromises of the Eureka-Rebecca System
After the fall of France in 1940, London gradually introduced clandestine operations into the European Theater to destabilize the German occupation. Operations by air, however, had delivered only a few agents by 1942. This modest start reflected not only the beginnings of a new type of warfare, but also the constraints of successfully delivering agents by air during the limited full-moon period available each month. In 1941, following the Air Ministry's substantial success with defensive radar development and employment during the Battle of Britain, the British Telecommunications Research Establishment (TRE) developed a concept employing a small ground-based radar beacon that enhanced clandestine air navigation, particularly at night. TRE personnel nicknamed the ground portion Eureka, and the airborne counterpart Rebecca, and began developing test sets for some of the first British special operations. (6)
London fielded preliminary versions of an "Mk I" Eureka radar beacon in Holland and Czechoslovakia, where the devices first fell into German hands. In March 1942, the British Royal Air Force (RAF) dropped three SOE-trained Czech agents into German-occupied Czechoslovakia. This team, code-named Out Distance, carried one of these beacons. Out Distance's unique mission required the placement of the Eureka beside the Czech Skoda steel works, at that time producing weaponry for the German armed forces. The RAF planned to send bombers to home-in on the beacon, and destroy the factory. Like a number of the Czech teams dropped into Czechoslovakia in 1942, however, Out Distance found conditions there extremely hostile, and two of its three members quickly fell victim to the Gestapo (German Secret State Police). A Czech farmer subsequently found their Eureka beacon hidden on his farm and turned it over to the Gestapo. (7) Shortly after the neutralization of Out Distance, SS Lt. Gen. Reinhard Heydrich, the former Gestapo chief recently appointed acting Reichsprotektor of Czechoslovakia, wrote Adolf Hitler's aide, Martin Bormann. In his memo, Heydrich reviewed the recent capture of clandestine equipment in Czechoslovakia, and drew a link to reports he had read about similar "modern equipment" German intelligence recently discovered in Holland. (8)
In March 1942, the counterintelligence service of the German armed forces high command, the Abwehr, began Operation "North Pole," a long-term penetration and manipulation of SOE's Holland agent network. By 1944 the Abwehr in Holland, under the direction of Maj. H. J. Giskes, would capture more than fifty British agents, most of Dutch nationality, which London had sent back into the Netherlands for sabotage operations. In one of the longest and most disastrous radio games of the War, the Abwehr teamed with the German SS Security Service (SD), to force captured agents to radio false messages to SOE's Dutch section in London. They intended to deceive SOE into continuing additional DZ operations that would also fall under German control. Berlin could then neutralize or manipulate Allied clandestine operations in the country. (9) In May 1942, Giskes' team, with the assistance of Dutch police impersonating resistance agents, captured SOE's Beetroot team on their own DZ, along with the team's Eureka beacon. SOE had recently trained the two Dutch operatives of Beetroot on the Eureka system, in order that they could then instruct other agents in Holland on its use. German radio experts, when they first analyzed Beetroot's Eureka, concluded the set was some type of aircraft beacon device; but the Abwehr did not understand its true use until told by Beetroot's agents under interrogation. The German Abwehr essentially received a description of the Eureka's operation by experts specifically trained to teach Eureka use to Allied agents. (10)
The Eureka beacon presented a unique problem for Allied designers, because the secret system had to be employed behind enemy lines. While the range and frequencies of the Eureka system remained classified until the end of the war, the Allies considered the fact that their agents used such a device, secret through most of 1943. To avoid compromise of Eureka beacons, therefore, Britain's TRE engineered security features into the beacon design. Yet these protective measures failed in both Czechoslovakia and Holland. The Eureka's passive frequency design (the beacons activated only when prompted by friendly aircraft emitting Rebecca's interrogating frequency), intended to deny enemy electronic "direction-finding" operations against active beacons, could prove irrelevant. For instance, the Gestapo captured intact Out Distance's Eureka hidden away at a farm; and the Abwehr's radio game with SOE put Beetroot's DZ (and their Eureka) directly in German hands. In both cases, the assumed electronic countermeasure difficulties against a passive system like the Eureka never materialized. In addition, the lack of an agent's supplemental flashlight signal, typically required to assure approaching Allied aircraft that the beacon was in friendly hands, proved irrelevant in Holland. On his first attempt to use the Eureka in Holland, Giskes took the beacon to a known Allied DZ, and waited until late evening to activate the set. Giskes' team heard an approaching RAF aircraft, but never sighted the plane in the pitch-black sky and never attempted a supplemental flashlight signal; but Giskes did receive a drop of six...
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