So much of our understanding of the Second World War is shaped by film. Perhaps the most famous example is The Great Escape. At the heart of the Polish city of Poznan, in a small glade surrounded by undulating parkland, are the graves of the 48 men who lost their lives in the breakout from Stalag III in March 1944. We visit their graves and contemplate the reality behind the legend. We find out more with historian Guy Walters and speak to a Prisoner of War Veteran, Victor Gregg.