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The Peace of Riga in 1921 between Poland and Soviet Russia ended the Polish-Soviet War.
Amidst the Russian Civil War another war was being fought, this one was against the newly recreated state of Poland. In 1920, the Poles were eager to retake all the territories of the Polish-Lithuanian Commonwealth from their traditional enemy, Russia. The historian J.F.C. Fuller described the Battle of Warsaw as one of the most significant battles ever. If the Bolsheviks had occupied Poland they would have been in a position to come to the aid of German Communists and possibly ensure the success of a Soviet revolution in Germany. The Treaty of Riga (March 1921) led to an expansion of Poland and the addition of some 6 million Ukrainian and Belorusian citizens; however, Poland was unable to fulfill the obligations of its alliance with Ukraine.