I recommend watching the EXTRAS here, the MAKING OF interview with the director (who also acts in this) which explains the inspiration for the film - letters written by a man called Arthur which led the director on 8 years of research.
The result is a slight, modest, low-budget biopic which is only just over an hour long. The story is possibly not strong enough to sustain more, fascinating though it undoubtedly is. For me, this would be perfect as a docu-drama for TV.
Lots of hand-held camera footage and fascinating detail. They use what they have to best effect.
Interesting as the only Dutch film on WWI I know of - perhaps because Holland was neutral in that conflict so any Dutchmen who wanted to fight against Germany had to sign up with the French foreign legion.
Worth a watch esp for anyone interested in films about World War One. 3 stars