" In my view they made assumptions about the effectiveness of the shelling and the defences in the German trenches that were completely ...."

You are entitled to your view but what is it worth when it is contradicted by every single historian who has actually made a study of it?

"You've spent quite a bit of time in this thread telling us how well led our boys were, "
No.
How would I know.
I have just shared with you the results of actual historical research as reported by the actual historians.

You three in your delusions think you know better, but everyone else will see you as fools.
You lose the debate because you have nothing to support your assertions, except more assertions.