I re-watched this as I am currently reading the history of Crete during WW2. Many of the component parts of the true events are in the movie, which makes it a pretty good representation of what happened without it being a documentary. Of course, you have to factor in the 1950s acting and effects limitations but, having read a little about the real-life players, it wholly underplays events. Those guys spent a long time in the mountains fighting the Nazis - might have made them a little crazy.
Review of Night Ambush
