This book is great, the only thing I disagreed with was the books title. However, the author (Davies) does describe how the events led to a full blown war of independance and one of the conclusions of the book is that the war could possibly have won if his luck had been better. Chapters describe in depth the reasons for the revolt and the allies and enemies of Owain and his cause. He also describes how the war was fought and the aftermath and submission.
The bad luck for Owain was that the Scots were pacified, the French declared a truce with the English, Hotspur lost, the Irish were not interested in helping, and one of the winters was really bad. Much of this happened in one or two years. Also, Henry V proved to be a good tactician and tough adversary, much better than Henry IV.
The book is evidence based and the author is careful not to write anything without qualifying it with evidence and sources. It is still fairly easy to read and a very good read, I highly recommend it.