"As (nearly) everything else in the film is meticulously researched,"
Not too sure about the river scenes, either: I've cycled across northern France, and been on a battlefield tour of the trenches, but I don't recall seeing a fast-flowing river in a gorge, or white-water rapids. I could be wrong about this, though. (Now that's something you don't read on the Mudcat very often!)
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sj