Its importance derived from the use of the Kémo in provisioning Fort Sibut and linking the Ubangi trade with Lake Chad.
The settlement was founded in 1891 by the agriculturalist Jean Dybowski as Kemo (Kémo) and moved to its present site in 1899.
In 1900, it was renamed for Marshal Possel-Deydier, who was killed in combat against Rabih az-Zubayr at Kouno the year before.
It possessed no proper fortifications whatsoever and largely consisted of a central quad surrounded by huts and official buildings.
[3] The locality at the site is now known simply as Possel, part of the commune of Galafondo, prefecture of Kémo in the Central African Republic.