This is a first book by an American amateur military historian. He tells us that an enormous amount of research, both in the USA and the UK, went into the project, and he proposes that the book could be regarded as the source book on this episode of the war.
That might sound far-fetched, but when the book is studied, the claim is not a wild one. It is comprehensive in geographical and period coverage. It is, in fact, probably the best book by some way that we have seen on the subject.