I had a similar problem with Letters From Iwo Jima which showed Japanese soldiers showing compassion to American soldiers. Yeah right.The British and French High Commands were incompetent. They would plan and launch attacks that they knew would fail, but carry them out anyway because their planning had gone so far that they were unwilling to cancel their operations. Their incompetence and lack of concern for their men resulted in the massacre of thousands in one go.
The French were so bad that the men in their army literally mutinied.
There was one battle I read about where the British High Command planned an attack based on a salient in the German lines. They took so long planning it that the Germans had time to audit their lines, discover the bulge and eliminate it by straightening their line. The BHC knew that any reason for launching the attack had long vanished but went ahead and did it anyway, knowing it would be a massacre and a failure. All they cared about was they had put it into motion and were not about to stop it. The lives of their men were the last thing they were concerned about. I wish I could remember which battle it was?
Did you know that during the "Battle of Vimy Ridge", the Canadians involved in the attack were running from shell hole to shell hole, taking cover wherever they could. The British Army unit on their flank (IIRC, Scottish Highlanders) were walking upright in a straight line because they were trained and ordered to do so. Canadian soldiers involved in the battle were literally stunned by what they were seeing. They could hardly believe it. Those men got mowed down due to the stupidity that was rampant in the British Officer Corp.
That is why I find the premise hard to swallow of a British command being concerned about 1600 men, no matter what they were walking into. The French and British Commands were nothing but war criminals and the Germans were not far behind.
"Paths of Glory" showed the true face of the French and British commands in WW1. They were venal, incompetent and criminal.
All that being said, I'm not saying the film is going to be bad. I most likely will go to see it anyway I just will find anything involving "caring" British commanders to be hard to swallow.