If any one of your "historians", publishing their revision of someone else's revision of jingoistic government propagandists revisions, had stood in the trenches with the like of Owen and Sassoon, they might be more credible.

They would now be dead silly!
Why put historians in quotes.
That is their profession, and they rely on contemporary sources from the men who did stand in the trenches.
They find that Sassoon and Owen were very unrepresentative of them.

Why not do some reading and find this out for yourself.
You could start with the BBC site I linked to.