Operation Barbarossa saw a clash of arms between Nazi Germany and the Soviet Union of unprecedented scale and savagery, but what was it really like to serve on the front line of the Eastern Front? The historian Rob Schäfer has given History Hit exclusive access to the diaries of Lt. Friedrich Sander, a panzer commander and one of the 3 million German troops involved in Operation Barbarossa. The diaries are brutal in their honesty openly describing the atrocities Sander was involved in and his opinions about Jews and the Soviet population. They also describe the horror of combat and his doubts about the cause, in whose name, he fights. In this episode, Rob describes how he came into possession of the diaries and why they offer such a unique insight into the mindset of someone fighting for the Wehrmacht.