Great Raids of World War II episode 3 - Radar Beam Raiders: As RAF Bomber Command began to strike back at Nazi Germany, it was soon suffering unsustainable losses from the Nazi air defence system. At its heart were as yet unidentified radar systems using wavelengths which urgently needed to be cracked. At last, in December 1941 a key German radar installation was located at Bruneval near the French North Sea coast, and a team of Britain's new paratroops were sent in to seize it.