2: "you will see for yourself that it wasn't as men had been led to believe it was at the front?"

Who led them to believe anything untrue Musket?
No one.
Every day thousands passed from the front line back home.
All sworn to secrecy?
Journalists reported from the front lines.
There was a best selling book about trench war by a serving soldier.
A very realistic film was made of the Somme battle that virtually everyone went to see.

Recruiting was actually highest when things were at their worst, during the long and terrible fighting retreat from Mons.
During that, The Times published a special afternoon edition reporting that the British Army was defeated, and men flocked to join and help.

Your assertion can not be supported because it is wrong and born of your total ignorance of any of this.