I'll add this one to the list as my father just died this past Sunday and he was the one who introduced me to this move over 20 years ago. 1971's " The Last Valley " 
http://www.imdb.com/title/tt0065969/   http://www.youtube.com/watch?v=IOhEDvf1ZmU  Its not so much the equipment or the like in this film, something about it captured the feeling of depair that I always thought must have enveloped The 30 Years War as it dragged on and on and on.