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The Katyn forest massacre was a mass execution of Polish army officers by the Red Army near Smolensk, Russia. In 1939 the Soviet Union took advantage of the Germans invading western Poland and invaded the eastern half of it as revenge for the humiliating defeat the Red Army suffered by the Polish during the Battle of Warsaw in 1920. In 1940 the Soviets moved around 22k Polish prisoners(who were army officers) into the Katyn forest and had them executed by the NKVD(Soviet secret police). In 1941 as Poland became part of the Allied powers the Polish government in exile requested 15k Polish POWs from the Soviets, but the Soviet reply was that the prisoners had escaped to Manchuria and could not be located. In 1943 ironically it was the German army that had stumbled across the mass graves in Katyn which then filmed it and took pictures of it to show the world the evidence of the Soviet atrocity, which the Soviets then intern claimed that the Germans had caused it. The massacre was intentionally covered up as the "good guys" won WW2 and in July of 1943 the Polish prime minister in exile Władysław Sikorski's plane was intentionally crashed over the straits of Gibraltar by his pilot who was a secret communist. Russia also refused to accept responsibility for the massacre until the year 2010, which also in the same year Polish president Lech Kaczyński's plane was intentionally shot down(which killed him and all of his staff) while heading to Russia to attend a memorial for the massacre.