This is a well researched, heavily illustrated and easy to read book on the subject of Blitzkrieg or 'Lightning War'. The specific area of interest is it's application by the Germans in their invasion of Holland, Belgium and France in the summer of 1940. The meat of the book is in the middle. Part 3 (Blitzkrieg: Weapons & Methods) looks at the development of the Blitzkrieg concept, originating, Deighton says with Prussian military doctrines. Ideas by English Tank experts such as J.F.C. Fuller and B.H. Liddel Hart were added later. This section of the book naturally spends a fair amount of time on the emergence of the Tank and it's use as one of the principal weapons of Blitzkrieg.
Blitzkrieg is defined as 'a swift, sudden military offensive, usually by combined air and land forces'. Deighton adds - 'and as evolved by Heinz Guderian and used by his forces', giving credit to the man who perfected the concept. Indeed, the German breakthrough at Sedan in May 1940 (see Part 4 'The Battle of The Meuse') and the subsequent routing of the French army is a spectacular example of the use of Blitzkrieg. Offcourse any discussion about battles in France in 1940 must conclude with the Germans surrounding and trapping over 250,000 men of the British Expeditionary Force (BEF) on the French coast near Dunkerque.
It is to do with Dunkerque that the most startling supposition emerges from the book. The introduction was written by Gen. Walther Nehring, who in 1940 was Guderians' Chief of Staff and was with him at Sedan. Nehring writes with conviction, and Deighton's arguments seem to support the view, that if not for a precipitous Halt Order by Hitler, the German forces could have captured the entire BEF. It is argued that the prospect of a 'Disaster at Dunkerque', rather than the miracle that we have come to know of, would have been too much for the British to stomach. The opportunity for sueing for peace and of obtaining an end to the war by May 1940, would have been a real possibility in such circumstances.