What Warsaw Pact countries invaded Czechoslovakia during Prague Spring in 1968?
On August 20, 1968, Warsaw Pact forces–including troops from Bulgaria, the German Democratic Republic (East Germany), Hungary, Poland, and the Soviet Union–invaded Czechoslovakia. Approximately 500,000 troops, mostly from the Soviet Union, poured across the borders in a blitzkrieg-like advance. Because it is written by users, WIkipedia is not a reliable site UNLESS sources are cited.
