This isn't so much a war movie, as a movie about the impact of waiting! It features a strong and emotional performance from Sam Claflin ("Capt. Stanhope") as the borderline alcoholic who leads a platoon of squaddies in a trench in France in the Spring of 1918. They know a raid is coming - either by them, or from the opposing Bosch - but they don't know when, and so live in a heightened state of alertness and fear that challenges the wits of even the most robust of characters. The constancy of the peril has worn him down, however, and "Stanhope" is now not particularly robust - his mental fortitude is challenged above and beyond as he tries to motivate and manage the men under is command. The remainder of his outfit, including his deputy Paul Bethany ("Uncle") who tries his best to support his friend through the daily trauma as well as to inspire and support the other officers and men, and a very green Asa Butterfield ("Raleigh") try to hold things together as the inevitable tragedy looms larger by the hour. This is not an action film; indeed precious little warfare actually happens; it is much more of a poignant psychological, at times intimate evaluation of the unimaginable stress put on human beings by uncertainty, cold and apprehension; as well as of their determination, honesty and team spirit that hits home well when you are sitting in an armchair at home. Saul Dibb manages to build the tension well, and the insight into this trench warfare environment he delivers is genuinely touching. The sound could be better, though - it's difficult to hear the dialogue at times, but that's an incidental criticism of a well scored, good film.