Firstly can I point out it is not Rag's book it is a biography of Douglas Haig by Gary Mead.

"Rag's book is especially positive about Haig"

Really?

"This is true even if we acknowledge that his ambition for the battles he managed was inappropriately large for the tools at hand leading him into GROTESQUE ERRORS OF JUDGEMENT at Loos (1915, The Somme (1916) and the Third Ypres at Passchendaele (1917).........."

"Grotesque errors of judgement" is especially positive is it.