Svel Hassle has written a lot of books about his war experiences as a Dane in the German Army in WWII. Most of these fictional accounts but based on real-life events), the books have been widely released in Europe, but from time to time are available in North America as well (Corgi Press).
This is the one and only movie made from one of his books, a shame really, since Swen Hassle portrays way in a most realistic manner; neither making light of what is happening, not glorifying war, but emphasizing the "Kameradschaft" - the effects of the war's events on Swen and his friends.
The movie unfortunately has some flaws that keep it from being really great. Foremost of these is the casting of David Carradine as a German officer. Too bad, since his performance in this film is sub-par at best.
The casting of Bruce Davison as Porta is a great choice, and he really shines in this movie, and along with David Patrick Kelly (as "The Legionnaire") gives realistic performances.
One of the major reasons this movie didn't receive wider distribution was protests from a number of groups who thought the movie - although they probably had not seen it - glorified the Nazi regime. It doesn't - it portrays war as brutal (on all sides), with no leaders to rely on, rather only one's fellow soldiers to depend on for your life.
A side-note - Swen Hassle is still alive (at this writing) and until relatively recently, has still been writing (although not writing fiction any more). Two of the three major characters in his books (Tiny, Porta and the Legionnaire) survived the war as well.