Good movie. The heroes didn't take watch.
Just watched this for the first time, and thoroughly enjoyed it just like the other Zahler films. I don't need to rehash what others have posted before, regarding plot holes. My only gripe to add was that I couldn't believe the heroes didn't set up a watch schedule during their sleeping hours, instead relying on a trip wire. The trip wire didn't surround their camp either!
Even if they were only sleeping for 4 hours, each guy should have been tasked with a 1 hour watch.