Blitzkrieg: The Invasion of Poland to the Fall of France (Osprey General Military)

On 1 September 1939, Nazi Germany launched the invasion of Poland, employing a new type of offensive
warfare: Blitzkrieg. So named by Allied observers because of the shock and rapidity of its effects, this new
approach was based on speed, manoeuvrability and concentration of firepower. The strategy saw startling
success as the panzer divisions, supported by Stuka dive-bombers, spread terror and mayhem, reaching
Warsaw in just one week. Aided by the intervention of the Soviet Union in the east, the campaign was over
in a mere 36 days.

This astonishing feat was followed by Operation Weserьbung, the invasion of Denmark and then Norway in
1940, the first joint air-sea-land campaign in the history of warfare. Even more striking an achievement was
the swift and conclusive defeat of France during May-June 1940. Refusing to let its forces dash themselves
against the fortifications of the Maginot Line, Germany instead sent its divisions through neutral Belgium
and northern France in Fall Gelb (‘Case Yellow'), destroying Allied resistance and pursuing the remnant of
the British and French forces to Dunkirk in an audacious and devastatingly effective assault. During the
course of Fall Rot (‘Case Red') over the following 20 days, German forces pressed the attack and by 25 June
had forced France's leaders into a humiliating capitulation.