Benedict XV and Ratti repeatedly cautioned Polish authorities against persecuting the Lithuanian and Ruthenian clergy. During the Bolshevik advance against Warsaw, the Pope asked for worldwide public prayers for Poland, while Ratti was the only foreign diplomat who refused to flee Warsaw when the Red Army was approaching the city in August 1920. On 11 June 1921, Benedict XV asked Ratti to deliver his message to the Polish episcopate, warning against political misuses of spiritual power, urging again peaceful coexistence with neighbouring people, stating that "love of country has its limits in justice and obligations".