In 1970, due to his expression of disagreement with the Warsaw Pact invasion of Czechoslovakia he was forced to retire from the Faculty of Education at the Jan Evangelista Purkyně University in Ústí nad Labem.
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Five weeks before the Warsaw Pact invasion of Czechoslovakia, Špaček was injured in a head-on automobile collision outside the town of Havličův Brod (along the Bratislava-Prague highway) and briefly hospitalized.
When armies of the Warsaw pact invaded Czechoslovakia in August 1968, Vermeylen, who was secretly visiting Brno as a simple tourist, barely managed to escape to Austria.
In 1968 he was a reporter in Czechoslovakia during the Soviet invasion to quell the Prague Spring.
In 1968 he served in the 145th Motorized Rifles Regiment of the Carpathian Military District in Ukraine, participating in the Warsaw Pact invasion of Czechoslovakia.