He is referring to the Battle of Cuito Cuanavale that took pla | South Africa Reports

He is referring to the Battle of Cuito Cuanavale that took place during the Angolan Civil War and South African Border War between 1987 and 1988. During which the SADF stopped FAPLA from advancing towards UNITA's stronghold in Mavinga.

The Soviet Union supplied FAPLA with over a billion dollars' worth of new military hardware for the purpose of this offensive, and between 4 and 9 Soviet advisers were attached to each FAPLA unit on the brigade level.