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Source: No. 100 Group RAF

No. 100 (Bomber Support) Group was a special duties group within RAF Bomber Command. The group was formed on 11 November 1943 to consolidate the increasingly complex business of electronic warfare and countermeasures in one organisation. The group was responsible for the development, operational trial and use of electronic warfare and countermeasures equipment. It was based at RAF stations in East Anglia, chiefly Norfolk.
The group was a pioneer in countering the formidable force of radar-equipped Luftwaffe night fighters, using a range of electronic 'homers' fitted to de Havilland Mosquito fighters which detected night fighter radar and radio emissions and allowed the RAF fighters to home in onto the Axis aircraft and either shoot them down or disrupt their missions against the bomber streams. Other Mosquitoes would patrol around Luftwaffe fighter airfields ready to attack night fighters as they landed.
This constant harassment had a detrimental effect on the morale and confidence of many Luftwaffe crews and indirectly led to a high proportion of aircraft and aircrew wastage from crashes as night fighters hurried in to land to avoid the Mosquito threat (real or imagined).
From 1944–45, the Mosquitos of 100 Group claimed 258 Luftwaffe aircraft shot down for 70 losses. The gradually increasing threat from the RAF fighters also created what the Luftwaffe crews nicknamed Moskito Panik as the night fighter crews were never sure when or where they may come under attack from the marauding 100 Group fighters.

Top Mosquito ace with 100 Group was Wing Commander Branse Burbridge of 85 Squadron, with 21 claims from 1944–45.
The bomber squadrons of 100 Group utilised various specialist electronic jamming devices to disrupt German radio communications and radar. During 100 Group's existence over 32 different devices were evaluated and used. Specially equipped 100 Group aircraft would fly in the bomber stream. Much of this equipment was developed at the Telecommunications Research Establishment (TRE).
Special equipment used included Airborne Cigar (ABC) jammer, Jostle (jammer), Mandrel (jammer), Airborne Grocer (jammer), Piperack (jammer), Perfectos (homer), Serrate (homer), Corona (spoofer), Carpet (jammer) and Lucero (homer), used against German equipment such as Lichtenstein, Freya, and Wurzburg radars.

The combination of the Pathfinders' operations, the activities of No. 100 Group, the British advantage in radar, jamming and Window techniques, combined with intelligent attacking tactics, as well as the discipline and bravery of the RAF crews, have been remarkable. We had our (sic) severe problems in trying to defend Germany in the air