After a bloody battle, some English soldiers find themselves wandering the empty World War 1 battlefield. They happen upon a German trench and capture a German soldier. Then, strange things start happening. Blood flows from the walls of the trench, they hear noises, and they start to turn on each other.
There are some good moments and some decent tension, but the ending is corny as hell. So to speak.
For the most part, the movie looks great. The gore is often quite unsettling. There are a few CGI effects that don't work so well, though.
It could have been worse.