We've had a brief discussion on this in the WITP-AE thread.
This is called 1917 and so presume it takes place in 1917. That being the case, why are they fighting on, lush, pristine green grassland?
This is 1917 - where troops literally drowned in mud.....in summer....
.... not this
Yes, I noticed that too, as well as some other sanitized aspects of the trailer. I guess I'm getting passive with all the PC rewriting of history today. I know it's wrong, you know it's wrong, others know it's wrong, but to the unknowing mind it might be OK and that's where the PC crowd steps in.
I think PC never entered into the equation - it was all based on budget. First, you have to find a landowner who is willing to let you turn 25 sq miles of grassland into a vegetation-free mudpit; then, having paid said landlord a GoT-sized fee, you have to actually turn 25 sq miles of grassland into a vegetation-free mudpit - before you shoot a single frame of film. Judging from the trailer, they did turn much smaller plots of land into mudpits; but even James Cameron would not be able to come up with the cash for the 25 sq mile mudpit required for a huge pan shot. Another director might opt for CGI, then endure the howls of derision for not keeping it real.