Nazi Germany’s 1941 invasion of the Soviet Union – Operation Barbarossa – ignited the greatest battles of the Second World War, and indeed in all of human history. The theatre of operations was huge, extending about 2,200 miles from the Arctic Ocean to the Black Sea, and roughly 1,500 miles from Stalingrad to Berlin. Over these vast distances the contenders fielded more divisions, employed more tanks, advanced further and faster, formed larger encirclements, and captured more prisoners than any two rivals have ever done, either before or since.
The task of making the course of this titanic conflict comprehensible to Germany’s senior leadership fell to cartographers in the General Staff of the Oberkommando des Heeres (OKH), the German Army High Command. Every day, they produced a very large scale Lage…