Based on Slavomir Rawicz's highly disputed 1956 memoir, The Long Walk
The setup sounds like it was ripped straight from a Werner Herzog playbook, as this motley crew is embroiled in the ages long battle between man and mother nature. The pursuing Russians are never really a factor, so this isn't a cat and mouse affair. It's solely about their arduous journey, and putting aside aside their many differences in order to survive it. Eventually joined by a mysterious girl in a similar predicament(the always excellent Saoirse Ronan), it isn't long before exhaustion, starvation, and the harsh conditions begin to take their toll.
Whether this story is actually true doesn't matter. It's whether or not it translates well to the screen, and unfortunately all the gorgeous cinematography in the world can't make up for bland characters. We're never given a reason to care about most of the people on this journey, and the few who have personality don't stick around nearly long enough. Its' a shame because Jim Sturgess is surprisingly strong as their earnest "leader", and Ed Harris has the rugged cowboy routine down pat. Saoirse Ronan provides a jolt of youthful energy the film was sorely lacking(you didn't realize it until she showed up). Colin Farrell could've done without the awful accent(I think that was Russian?), otherwise he's the one real source of comedy the flick has to offer. Weir shoots the film in a way that shows off nature's true power and dominance over these people, with their many casualties never shied away from by the camera. The unflinching tone of their quest is blunted by an attempt to wrap everything up in a nice neat happy bow, which might've worked if we'd gotten to know these characters more along the way.