I think at the the time of writing the review I just felt like I didn't have much to say about it, plus it feels like there is more to say about big picture books than books that focus on a general and his strategy.

Now that it's been a couple of days I can offer more thoughts -

When it comes to technology the author argues against the view that Haig was old-fashioned and didn't understand new technology. Instead he says the opposite, that if anything Haig was way too optimistic about how effective new weapons like gas and tanks would be.

For Haig's continued planning on a breakthrough Sheffield also defends this quite a bit. For a start it was politically difficult to do otherwise, the French wouldn't have accepted the British doing only small scale attacks and that the British public wouldn't have accepted neverending yet still costly bite and hold battles - hope of a eventual breakthrough the German lines was needed for morale. Additionally it would have been irresponsible of Haig to not have a plan if an offensive did have major success.

There is a lot of focus on the background and adminstrative stuff which led the British forces to be highly effective by the end of the war.

There is a also a lot on Haig's relationship with his subordinates. In these bits the author is quite critical of some of his Haig's commmanders like Gough and Rawlinson but also criticises Haig for not getting a strong grip on these men and making it clear what his intentions were.