The film is based on Danish writer Sven Hassel's 1979 war novel "Wheels of Terror". Hassel was actually part of the German Panzerkorp during the war and most of his novels are based on his experiences or stories he heard during the war, although some dispute the veracity of his work. He always puts himself in the novels, sometimes as a major participant and sometimes as a minor observer. The character of Sven Hassel also appears in this novel and is played in the movie adaptation by Slavko Stimac.