Polish-Soviet relations were broken off on April 25 , 1943 due to the Katyn massacre , and it became obvious that the advancing Red Army might not come to Poland as a liberator but rather , as General Rowecki put it , " Our Allies ' Ally " . On November 26 , 1943 the Polish government in exile issued an instruction to the effect that if diplomatic relations with the Soviet Union were not resumed before their entry to Poland , the Home Army forces were to remain underground until further decisions were made . However , the Home Army commander took a different approach , and on November 30 , 1943 the final version of the plan was created . It became known as Operation Tempest
Katyn massacre
Katyn massacre
Prelude to the Warsaw Uprising