This history is new to me.
Heathrow, you seem to be a WWII enthusiast so i can mention here another similar story which happened in the same bit of land and two years before and involved free french aviators.
First a little word about the context :
In september 1940, the territory known as Afrique ?quatoriale Fran?aise (now more or less Tchad, Cameroun and Gabon) seceded from the Vichy governement and rejoined the free french movement and the G?n?ral de Gaulle.
It was a major strategic move for the allies because it gave access to the south of Libya which was then an italian territory and permited an attack on two fronts (free french by the south and british by the east).
In November 1940, De Gaulle appointed the then colonel Leclerc (future four stars general) to conduct attacks of the italian fort of Koufra via northern Tchad
He has the support of a free french bomber squadron equiped with Bristol Blenheim , a two engines medium bomber plane
Of course in this hostile and desertic environment , the situation is less than favourable , without navigational aids ,radars or radio , even the slightest navigation error can lead to a deviation of several kilometers.
The 4 february 1941 , a raid of four blenheim took of of Ounianga en route to Koufra .
One of them never return : the Blenheim coded T1867 was lost and its crew ( Sous-Lieutenant Claron, sergent-chef Devin and sergent Le Calvez) reported missing.
It's only the 29 march 1959 that the wreck was discovered by a group of sheperd in the desert of north east Tchad near the border of Libya and Soudan.
Three squeleton were found under the wings of the plane and send back to France.