Also known as the Warsaw Pact invasion of Czechoslovakia, it was known as Operation Danube when over an army of 250,000 invaded the country.
The Army consisted of troops from Poland, Soviet Union, Hungary, East Germany and Bulgaria.
The invasion was conducted to ensure the 'Prague Spring' reforms do not come into effect and that the Community Party in Czechoslovakia, which was friendly to Soviet Union, remained powerful and influential.
However, the invasion was unpopular within the country and a passive-aggressive reaction was seen from the local population. Non-violent acts such as, food, water, and other resources were denied and anti-Warsaw pact graffiti welcomed the soldiers everywhere they went.
There were also negative reactions from around the world and even within the Warsaw pact itself.
