Roger Corman directed this WW2 film about a small group of soldiers who must destroy an very important railway bridge. Michael Forest is Lt. Factor who is always at odds with Sgt. Potter, played by Frank Wolff.
This was filmed back to back with "Beast From Haunted Cave" with the same cast. Wally Campo and Richard Sinatra co-star along with Sheila Carol. Corman himself is a German soldier who pursues the five men on the mission.
This is very low budget, of course, but well done an it will hold your attention. The plot is unique and the scenery in the snowy Dakotas is always beautiful. if you haven't seen this, check it out.