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It sounds similar to 'Dunkirk' - very immersive, but don't go pointing out historical nit-picks and plot holes as that is not the point. The point is to make you feel like you are there, which it sounds like it does well (as did Dunkirk).
Just saw it. Loved it.It’s full of implausible things - you could argue that the whole central premise is basically flawed. Given that the nature of the Western Front was that the front lines were essentially continuous and unbroken, without gaps the enemy could exploit (which was the whole reason for almost 5 years of stalemate slaughter) why would you have to send two runners FORWARD across No Man’s Land and through the abandoned German lines in order to reach another British Division? Because they’re not going to be on their own, ten miles out in front of the rest of your lines. Why wouldn’t you just go along the line? Makes no sense at all. And then there are several other lesser points at which you go ‘well that doesn’t make any sense’ and a few nerdy military history buff moments where you go ‘well that’s not right’...
Then there's the small point of why they wouldn't fly an aircraft over and drop a message - standard operating procedure by mid-1917.
In addition to the point mentioned above, you have to wonder - unless it's explained in the script - why the formation in question lacked a radio set, and, even given a sound reason for this, why a humble pigeon might not have been employed.
https://www.theguardian.com/film/2020/jan/03/the-stupidest-thing-humanity-ever-did-to-itself-sam-mendes-and-colin-firth-on-1917