Shot 99.9% INSIDE the trench to convey the sense of claustrophobia. It works. You can almost smell the trench. I personally think that the low budget style produced a happy bi-product rather than it being planned. Not a conventional war movie but a VERY British close up at the inter-personal relationships during WW1 before the Battle of The Somme. The youthful Paul Nicholls eminates a young 'duty to your country soldier' and in the alone-ness he fantasises over the memory of a young girl who merely served him with a stamp at his local post office. Loads of blood and guts and a particularly harrowing scene - almost subliminal - which works well as it ensures your brain remembers the real horrors of war at close quarters inside a trench. The usual chain of command reveals why delegation can sometimes disguise cowardice and fear. The film achieves its objective and portrays the awful waste of life.