Video: 'Cold War - Red Spring 1960s - Part 14/24' (Aug. 20-21, 1968, at 39:54)

(Tuesday, August 20, 1968, 11:00 p.m. CET; during the Warsaw Pact invasion of Czechoslovakia, part of the Cold War) — The Soviet Union and four other Warsaw Pact nations – Bulgaria, Hungary, East Germany and Poland – began invading Czechoslovakia tonight with approximately 250,000 troops and 2,000 tanks to crush Alexander Dubcek’s Prague Spring liberalisation reforms and strengthened the authority of the authoritarian wing within the Communist Party of Czechoslovakia (KSC).

The invasion eventually reached 500,000 troops, 6,300 tanks and 550 combat aircraft and 250 transport planes in what became the largest Soviet attack in peacetime and the biggest operation in Europe since World War II had ended.

Video: 'PBS Documentary "Television" - Episode 4 of 8' (Aug. 20-21, 1968, at 38:59)