IT had been a lilting summer day throughout Eastern Europe. In the cool of a starry evening in the Czechoslovak capital of Prague, vast Wenceslas Square was alive with couples strolling arm in arm, tourists and Czechoslovaks bustling homeward. Then, just before midnight, telephones began to jangle as friends and relatives living in border towns frantically put in calls to the capital. The alert was spread by taxi drivers and owners of private cars, who raced through the medieval streets with their horns wailing warning. Soon the...

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