A novelização refere-se à "Guerra contra os Territórios do Sul".
This was the army humanity had fronted in one of the worst wars of its entire checkered history—the War against the Southern Territories. It was largely because of this war, with its years of violence and astronomical numbers of casualties on both sides, that humanity had firmly rededicated itself to pursuing peace if at all possible. Peace bought with the bloodiest of prices, Okto-Bar remembered his father saying. He continued to read the list of ships and their captains.
Valerian and the City of a Thousand Planets: The Official Movie Novelization
E o filme em si identifica os bandidos (sobre Mül) como sendo "o Arysum-Kormn "
The war against the Arysum-Kormn led to the destruction of Planet Mül.
Nada mais específico é conhecido além do que a humanidade ganhou, e ficou tão horrorizado com a morte e a destruição que se dedicou à causa da paz galáctica.