On February 22, 1972 a faction loyal to Ange Diawara attempted a coup against President Marien Ngouabi. Joachim Yhombi-Opango was instrumental in ending the coup. After more than a year of evading capture Diawara was ambushed and killed by forces loyal to Ngouabi.
References
1972 Republic of the Congo coup d'état attempt Wikipedia(Text) CC BY-SA