Spectre of Communism
The Treaty of Versailles and the European Revolutions in the wake of World War I (9 April 1919)
Historical Map of Europe
When the Great War ended, the Bolsheviks renounced their treaty with Germany and began to reconquer the old Russian Empire. Europe was still very unstable and Communist revolutionaries across the continent rallied to the Bolshevik cause. The most successful was Bela Kun in Hungary, who invaded Czechoslovakia.