In the introduction to the book, Roger Moorhouse explains his rationale for writing this book - there are numerous english language books on certain topics of WW2 (e.g. D-Day, Battle of the Bulge), but very limited english language resources on others - as a result the German/Soviet invasion of Poland often only sees a few sentences or paragraphs in a book or article.Moorhouse's Poland 1939 provides an in depth look at the German/Soviet invasion of Poland that is widely recognized as the event that kicked off the European portion of WW2. He covers key areas including the diplomacy and military actions that were a part of this action. There is a section on Polish history that provides insight into the situation they faced at the start of WW2, and their history that influenced how they chose to resist, even after occupation.Moorhouse provides a number of firsthand accounts that help illustrate the situation of Polish leaders, soldiers, and civilians. An important part of this book is unpacking myths, such as the story of the Polish cavalry charging German tanks - its origins and the rationale for its spread. Another important area this book covers is the different impacts of German and Soviet occupation, and the different choices Poles faced in navigating this crisis.A well written, well researched book that provides a greater understanding of the German and Soviet campaigns to capture and occupy Poland in 1939.