I watched the movie in theatre. I think it's well shot, great overhead sound effects, good score, nice detail in the no man land but...the story is so stupid. The idea of sending two soldiers to warn others stranded is crazy. They could have dropped a message by plane. Also, how come they will attack a position if they are cut off from the rest of the army? What about reinforcements, ammos, food, and orders? No one will move like that. The idea of the germans retreating to create a trap it's also quite ridicolous. And how come the two soldiers went through hell crawling through mud, walking through tunnels only to find themselves together with a column of soldiers calmly advancing with trucks? (Trucks can't ride over trenches, so it means they had a road). And the city with stranded german soldiers drunk is also unrealistic. Are those germans so smart to live a city on the frontline with just some soldiers cocking around?
The pace worked well until the first soldier died, then it became just a mess where the other wanders confuse. Also again we see indian and black soldiers mixed with british, when colonial troops were put different units. Doesn't surprise me, since i've seen that middle age scotland was full of black people according to movies like Mary Queen of the scots. I had really high expectations for this movie but I felt quite let down. If you want to shoot a movie set in a historical period, stick to realism. Otherwise do something like man in the high castle