After the military intervention on the night of August 20, a reversal of the reform policy was carried out It was called the "process of normalization". Foreign troops remained on Czechoslovak soil until the situation had stabilized. They were the "help" provided by the Soviet Union in the fight against counter-revolutionary forces. The Communist Party of Czechoslovakia was forced to suppress all moves made towards democracy. But it finally had to surrender on December 9, 1989, in a revolution later called - "The Velvet revolution".