Girl Arrives for Czeck, 08/27/68: A member of a student group visiting Czechoslovakia at the time of the Soviet invasion returns to Houston. She then shares her account of helping two Czechoslavakian guides flee the country. On the night of August 20, approximately 200,000 communist troops from five Warsaw Pact nations–the Soviet Union, Bulgaria, Hungary, East Germany, and Poland–invaded Czechoslovakia. The invading force detained government leaders and transported them to Moscow, as well as seized control of Prague television and radio stations. More than 120 Czechoslovakian civilians were killed, most of them protesters. The attack was intended to crush the democratic reforms of the "Prague Spring," a brief period of liberalization in the otherwise communist country. On August 27, Czechoslovakia's First Secretary Alexander Dubček returned to Prague and announced he had agreed to curtail his progressive reforms. Dubček was forced to resign in April 1969 following anti-Soviet riots.