No. 100 Group RAF

No. 100 Group RAF was a specialist formation of RAF Bomber Command established on 11 November 1943 to bring Britain's increasingly complex electronic-warfare and bomber-support capabilities under one organization. Operating primarily from airfields in Norfolk and other parts of East Anglia, the group combined intelligence, communications, electronic attack, radar countermeasures, and offensive night-fighter operations in support of the RAF's strategic bombing campaign during the Second World War. The group's creation reflected the growing importance of the electromagnetic spectrum in the air war over Europe. German night fighters depended on radar systems, radio communications, ground-control networks, and navigation beacons to locate and attack Allied bomber streams. No. 100 Group worked to disrupt those systems while also providing aircraft that could detect, pursue, and attack German fighters. Its activities therefore extended beyond conventional bombing: the group helped conceal bomber formations, confuse German controllers, interfere with radar-directed interception, and directly attack enemy night fighters. Its first constituent unit was No. 192 Squadron, previously involved in monitoring German radio traffic through the RAF's Y Service. The squadron moved to RAF Foulsham in Norfolk in December 1943. Group headquarters initially operated from RAF West Raynham before moving to Bylaugh Hall in January 1944. From this central Norfolk location, the organization coordinated operations across a network of eight airfields. Its force eventually numbered approximately 260 aircraft, including large numbers of de Havilland Mosquito night fighters and intruders, together with Halifax, Stirling, Wellington, B-17 Flying Fortress, B-24 Liberator, and briefly Bristol Beaufighter aircraft. No. 100 Group's aircraft carried or supported a wide range of electronic systems. Jamming equipment such as Airborne Cigar, Jostle, Mandrel, Airborne Grocer, Piperack, Carpet, and Corona interfered with German radio and radar networks. Homing and detection systems including Serrate, Perfectos, and Lucero helped RAF crews locate enemy radar emissions or identify specific transmission sources. These systems were used against German Lichtenstein, Freya, and Würzburg radar installations and were developed or evaluated in cooperation with the Telecommunications Research Establishment. The group's Mosquito intruders were particularly important. Equipped with airborne-interception radar and radar-detection equipment, they patrolled near German fighter bases, airfields, and staging beacons. Some attacked night fighters while they were airborne; others harassed aircraft attempting to land. This imposed a constant threat on Luftwaffe crews and contributed to what German personnel called Moskito Panik. No. 100 Group records credited its Mosquito force with 258 Luftwaffe aircraft destroyed between 1944 and 1945, against 70 aircraft lost, although such wartime claims should be understood within the conventions and limitations of combat reporting. The formation was not a conventional commercial brand and had no consumer products, corporate ownership, or independent financial activity. Its principal outputs were operational capabilities, technical experimentation, intelligence, and combat support. It was disbanded on 17 December 1945 after the end of the European war. The group's legacy lies in the institutional development of airborne electronic warfare, radar countermeasures, communications intelligence, and specialized night-fighter operations within the RAF.

No. 100 Group RAF emerged from the RAF's need to coordinate a rapidly expanding collection of electronic-warfare and bomber-support activities. During the early years of the Second World War, British research organizations, signals units, bomber squadrons, and fighter formations had developed separate methods for monitoring German communications, jamming radar, deceiving air-defense controllers, and locating enemy night fighters. By late 1943, the scale and technical complexity of these activities justified a dedicated Bomber Command group. The formation was established on 11 November 1943, initially under Air Commodore Addison. No. 192 Squadron became its first operational unit. The squadron had previously conducted radio monitoring as part of the RAF's Y Service and moved to RAF Foulsham in Norfolk on 7 December. Headquarters were first located at RAF West Raynham and then moved to Bylaugh Hall, near East Dereham, in January 1944. The Norfolk location provided a central administrative base for the group's stations across East Anglia. The group's first recorded operation took place during the night of 16–17 December 1943, when two Beaufighters and two Mosquitoes from No. 141 Squadron supported a Bomber Command raid on Berlin. Its first combat success followed on the night of 23–24 December, when a Beaufighter crew claimed a Junkers Ju 88. Early operations were constrained by equipment and readiness problems. The Mosquito aircraft initially available to the formation were relatively old and in poor condition, while the Beaufighters assigned to it were being transferred elsewhere. With Nos. 239 and 169 Squadrons still training, the group could provide only limited support to some early Bomber Command operations. As its squadrons became operational in 1944, No. 100 Group developed a combined electronic and kinetic approach. Specialist aircraft flew within or around bomber formations to disrupt German radar and radio networks. Short Stirlings carried Mandrel equipment against Freya early-warning radar, while later Boeing B-17s used Carpet systems against Würzburg gun-laying radar. No. 223 Squadron operated long-range B-24H and B-24J Liberators carrying multiple Jostle radio-telephone jamming units. Other aircraft used systems such as Airborne Cigar, Airborne Grocer, Piperack, and Corona to interfere with communications, confuse radar operators, or create misleading signals. The group also used Mosquitoes as dedicated intruders. Their Mark IV airborne-interception radar and Serrate equipment allowed crews to locate German aircraft and home on radar emissions from Lichtenstein night-fighter sets. Some aircraft loitered around enemy airfields and staging points, attacking German fighters in the air or threatening them during landing. The pressure created by these patrols affected Luftwaffe tactics and morale. German crews reportedly used the expression Moskito Panik for the fear of encountering RAF Mosquito intruders without warning. No. 100 Group operated approximately 260 aircraft from eight airfields. Its order of battle included Mosquitoes, Halifaxes, Stirlings, Wellingtons, B-17 Flying Fortresses, B-24 Liberators, and a limited number of Beaufighters. Supporting elements included No. 1692 Flight at RAF Little Snoring, No. 1699 Flight at RAF Oulton, a communications flight that moved from West Raynham to RAF Swanton Morley, and No. 80 (Signals) Wing, which handled Meacon beacons and related radio countermeasures and intelligence work. From 1944 to 1945, the group's Mosquito units claimed 258 Luftwaffe aircraft destroyed for 70 losses. Wing Commander Branse Burbridge of No. 85 Squadron was identified as the leading Mosquito ace associated with the group, with 21 claims during that period. These operations formed part of the broader Allied combination of Pathfinder marking, radar technology, radio deception, jamming, Window, coordinated tactics, and sustained bomber operations. No. 100 Group was disbanded on 17 December 1945. Its wartime experience contributed to the post-war understanding of electronic attack, airborne signals intelligence, radar warning, communications disruption, and the integration of specialist technical capabilities with conventional air operations.

• 1945

  End of wartime operations

  [1]No. 100 Group RAFen.wikipedia.org

  The group's operational period ended with the conclusion of the European war and the winding down of its Bomber Command role.

• 1945

  Group disbanded

  [1]No. 100 Group RAFen.wikipedia.org

  No. 100 Group RAF was formally disbanded on 17 December.

• 1944

  Headquarters established at Bylaugh Hall

  [1]No. 100 Group RAFen.wikipedia.org

  The group moved its permanent headquarters to Bylaugh Hall near East Dereham, creating a central base for its Norfolk airfields.

• 1944

  Specialist squadrons become operational

  [1]No. 100 Group RAFen.wikipedia.org

  The group expanded its operational contribution as its Mosquito, bomber, signals, and jamming units completed training and entered regular service.

• 1943

  No. 100 Group RAF formed

  [1]No. 100 Group RAFen.wikipedia.org

  The group was established on 11 November within RAF Bomber Command to consolidate electronic warfare and countermeasures work.

• 1943

  No. 192 Squadron joins the new group

  [1]No. 100 Group RAFen.wikipedia.org

  No. 192 Squadron became the first unit assigned to the group and moved to RAF Foulsham in Norfolk in December.

• 1943

  First operational mission

  [1]No. 100 Group RAFen.wikipedia.org

  Four aircraft from No. 141 Squadron supported a Bomber Command raid on Berlin during the night of 16–17 December.

• 1943

  First combat success

  [1]No. 100 Group RAFen.wikipedia.org

  A Beaufighter claimed a Junkers Ju 88 during the night of 23–24 December.

A specialist Royal Air Force formation positioned at the intersection of electronic warfare, signals intelligence, radar countermeasures, and offensive night-fighter operations. Its role was to protect Bomber Command's aircraft and degrade the Luftwaffe's ability to detect, coordinate, and attack Allied bombers.

• Electronic jammer

  Airborne Cigar

  An airborne communications-jamming system used to interfere with German radio networks and reduce the effectiveness of fighter-control communications. It formed part of the group's broader effort to disrupt the command links connecting ground controllers with Luftwaffe night fighters.

• Radio-telephone jammer

  Jostle

  A long-range radio-telephone jamming system carried by No. 223 Squadron's B-24 Liberators. The equipment occupied the position normally used by the aircraft's ventral ball turret and allowed the Liberators to interfere with German fighter-control communications while operating with bomber formations.

• Radar jammer

  Mandrel

  Mandrel was a radar-jamming system carried by Short Stirling aircraft. It was used primarily against the German Freya early-warning radar network, helping to reduce the ability of ground stations to detect and track incoming Allied bomber formations.

• Radar jammer

  Carpet

  Carpet was carried by later B-17 Flying Fortress aircraft and directed against Würzburg radar. Its purpose was to interfere with the gun-laying and tracking functions that supported German air defense.

• Radar homing system

  Serrate

  Serrate enabled Mosquito intruders to detect and home on emissions from German Lichtenstein airborne-interception radar. This gave RAF crews a means of locating night fighters that were themselves using radar to search for Allied bombers.

• Radar-detection and homing equipment

  Perfectos

  Perfectos was among the specialist electronic systems evaluated and used by the group for identifying or exploiting German radar and radio emissions during night-fighter and countermeasure operations.

• Radio deception system

  Corona

  Corona was used as part of the group's electronic deception and communications-countermeasure activities. It contributed to efforts to confuse or misdirect German air-defense communications and control procedures.

• 1944Mosquito night-fighter intruder operations

  Germany · German-occupied Europe

  Mosquito aircraft used airborne-interception radar and Serrate equipment to locate German night fighters and attack them near enemy airfields, staging beacons, and landing areas.

  Outcome. The operations imposed a persistent threat on Luftwaffe night-fighter crews and became associated with the German expression Moskito Panik.

  Source
• 1944Bomber-stream radar and communications jamming

  Germany · German-occupied Europe

  Specially equipped Stirlings, Fortresses, Liberators, and other aircraft jammed German early-warning radar, gun-control radar, and radio-telephone communications while operating in support of bomber formations.

  Outcome. The campaign formed one element of the wider Allied electronic-warfare system used to reduce the effectiveness of German air defense.

  Source
• 1943Bomber Command support operations

  Germany · German-occupied Europe

  No. 100 Group began operational support of Bomber Command raids in December 1943, combining electronic countermeasures with intruder sorties intended to disrupt German night-fighter defenses.

  Outcome. The group moved from limited early deployments to a substantial specialist force during 1944 and 1945.

  Source

• 1944

  Combine electronic attack with offensive intruder operationsStrategy

  Background

  German night fighters relied on radar emissions, ground-control communications, and airfield networks to intercept Allied bomber streams.

  Action taken

  No. 100 Group paired airborne jamming and deception with Mosquito aircraft capable of detecting, pursuing, and attacking German night fighters.

  Aftermath

  The combined approach disrupted enemy interception and added a direct physical threat around German fighter bases and landing areas.

  Source

• 1943

  Centralize electronic warfare within a dedicated Bomber Command groupStrategy

  Background

  British electronic warfare, signals intelligence, radar countermeasures, and specialist fighter-support activities had become too complex to manage effectively as scattered functions.

  Action taken

  The RAF established No. 100 Group to coordinate development, operational trials, intelligence work, jamming, deception, and offensive countermeasures.

  Aftermath

  The group became a dedicated operational center for airborne electronic warfare and night-fighter support until its disbandment after the war.

  Source

1. 1No. 100 Group RAFen.wikipedia.org