This book was a huge seller when it came out over a half-century ago and probably includes new information about the prelude and early battles of the Great War. It's lengthy but interesting, and anyone interested in the politics of war with find it worthwhile reading.
My real problem with the book is it's the choice of "big words." I am a retired college professor and have never seen a non-technical work use so many strange words that I can't define. The barrage of strange words is constant and seems to increase as the book progresses. You'll want to keep Webster's close at hand or use Kindle's built-in word dictionary in order to understand the full meaning of much of the writing.