Often written during imprisonment in Allied War camps by former German officers, with their memories of the World War fresh in their minds; The Foreign Military Studies series offers rare glimpses into the Third Reich. German General of Artillery, Walter Hartmann, served during World War II and was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves and Swords (Ritterkreuz des Eisernen Kreuzes mit Eichenlaub und Schwertern). The Knight's Cross of the Iron Cross and its higher grade Oak Leaves and Swords was awarded to recognise extreme battlefield bravery or successful military leadership. This is the General's guide to the principles of position warfare and retrograde movements using examples from his firsthand knowledge of the Russian Campaign.