In 1914 a new circumscription was added with Borkou-Ennedi, renamed Borkou-Ennedi-Tibesti in 1930 when the Tibesti was passed from Niger to Chad.
Consequently, southern troops stationed in Borkou-Ennedi-Tibesti Prefecture were looked upon as an army of occupation.
Among the prefectures of Chad, the most represented were the BET, Habré's native region, with 4 members and 3 from the Moyen-Chari.
The derde (derda, derdai, dardai) is the title held by the highest religious and political authority among the Toubou Teda of the Tibesti, in north-western Chad.
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The Teda of the Tibesti in the 17th and 18th centuries distinguished themselves for their raids from the Fezzan to the north and to Borno to the south.
Then he was stationed in Lorraine with the 41st RMIC until June 1938, when he was sent to Chad to command the subdivision of Tibesti with headquarters in Zouar.
In the highlands of the central Sahara beyond the Libyan desert,... in the great massifs of the Tibesti and the Hoggar, the mountaintops, today bare rock, were covered at this period with forests of oak and walnut, lime, alder and elm.
Oueddei Kichidemi was the father of the former Chadian President Goukouni Oueddei and was the tribal leader, or derde, of the Toubou Teda of the Tibesti during the First Chadian Civil War.