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Virtual Earth map of Radio Guidance and Radar - Fort Allemand near La Langotterie

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This was never a fort, but after the German invasion the local population were excluded from all sensitive sites such as this and it became known as " The German Fort".
On the same day that this region of France fell to the invading Germans they were seen surveying this site. (June 18th 1940) They needed a site on high ground on which to build a new and early form of radio guidance, permitting planes to fly by night.
Radio navigation systems had been in use for a few years, used by both military and civilian aircraft.
This usually took the form of a transmitter at the destination or on the route, and the plane flew along the signal.
This could be used for bombers returning home after a mission, but could not obviously be used on the outward leg.
It was also very inaccurate for a flight of over 200 kms, so the reverse of this system was needed.
The Germans were the first to use such a system (Knickebein) and the two navigation beam transmitters were installed here and at Mont Pincon. The transmitter here was operational in late 1940 (although not in the bunker), and was first used for the bombing of Coventry on November 14th 1940. (The Blitz) The transmitters sent out two parallel signals, one dots and the other dashes. When the plane was on course, between the two signals a steady tone was heard. This later system was called the X-Gerat and was later refined to use four beams. This system had a very limited life span and the beams were very easy to jam by the RAF and even when the Germans changed frequencies several times during a raid, it was able to be blocked. This station was vital for the night bombing of England.


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