By the summer of 1940, a quarter of a million Polish prisoners of war had already been sent to Soviet prison camps. More than a million civilians deemed undesirable by Stalin were packed aboard cattle trucks to the far east of the Soviet Union. Many died on the journey, many more would die in the harshest conditions, toiling, starving and freezing on collective farms or labour camps in Siberia, the Urals or Kazakhstan. But then unlikely salvation came with the opportunity to join Anders' Army.