Much can probably be said, especially regarding the political situation in France in 1960 that led to the secondment of French advisers and legionaires to the Katangan separatists in what I term an officially-organized unofficial capacity, generally as mercenaries, in the Congo. However, I have previously written on these matters a number of years ago. Feel free to peruse these past answers if you're inclined.

• An answer regarding who Roger Falques was, as well as some context for French involvement in the Congo.
• A post on white mercenaries in the Congo in the 1960's.

If you have any particular questions stemming from those past summaries on the subject, feel free to ask them here and I'd be glad to answer as necessary.