not quite sure what to make of this.. great world building but the title is misleading (there's not really an actual war) and so is the little synopsis on the back.
I thought the whole book would be about humans messing up their relationship with other sektient life forms (trolls) and trying to get them back.
That's not quite what happened but it's one of the 5 or so subplots (there is no main plot apart from exploring the long earth)