His martial arts background is in judo, his older brother Bertrand being a medal-winning judoka for France in the 1990 European Judo Championships as well as the first and only French fighter to win a fight in Pride FC, while Amoussou's Senegalese father was also a successful karate stylist.
His trainers are one time PRIDE Fighting Championship fighter and older brother Bertrand Amoussou.
In April 2011, he defeated Nathan Shouteren via decision after a spectacular fight where he showed his "Psycho" style again.
However, War Machine was sentenced to a year in prison for an assault in Las Vegas, Nevada and was forced out of the bout and the tournament.
He faced welterweight champion Ben Askren in Bellator's seventh season in the fall of 2012.
Going 10–2 since leaving Bellator, Amoussou face Abdoul Abdouraguimov on June 25, 2022 at Ares FC 7 for the AFC Welterweight Championship.
[11] Amoussou faced Mickaël Lebout on December 8, 2022 at Ares FC 10, losing the bout via unanimous decision.