Rag, you are reading a biography of Haig that I have not read.
I recommend the more recent one by Sheffield.

No biography worth anything gives a purely one-sided view. Sheffield's does not.
A deceitful and dishonest person might be tempted to give a false impression of the overall conclusions by cherry picking just the negative bits.

What would you say the overall view of your biography is Rag?
Is the clue in the title, "The Good Soldier. A biography of Douglas Haig by Gary Mead?"