Voulet–Chanoine Mission is pretty unknown colonial episode in the late 19th century.
It happened late to the whole colonialism game, but the French were still looking to expand their colonial empire, conquer remaining independent African tribes near French territories and to solidify their rule in untamed parts Africa. The expeditionary force was made out of mostly African troops led by French officers.
Pretty shortly into the campaign the French expedition leader Paul Voulet (pictured) went literally insane, and started a campaign of mass atrocities against the tribal Africans that included the usual rape, murder and torture, and also particularly heinous acts like roasting children alive in cooking fires. Once the word of what he was up to reached French authorities, they sent colonel Jean-François Klobb to track him down and arrest him with an armed escort. Once Klobb finally found Voulet, Voulet incited his troops to shoot and kill him which they did. After that Voulet gave a speech to his officers, declaring that he is no longer a Frenchman, he is now a black chief, and will found a new empire. At this point his officers finally had a wake-up call which resulted in a mutiny. Voulet fought back and tried to shoot his own troops before fleeing to the jungle. He was killed the next day when he tried to return to the camp and retake the command. The French officers managed to retain control over their troops and completed rest of the expeditionary mission without further notable incidents, everyone kinda chilled out and stopped being murderous marauders after Voulet's death.