Poland 1939: The birth of Blitzkrieg

Osprey's examination of the German invasion of Poland, which began World
War II (1939-1945) in Europe, pitting the newly modernized army of
Europe's great industrial power against the much smaller Polish army and
introducing the world to a new style of warfare – Blitzkrieg. Panzer
divisions spearheaded the German assault with Stuka dive-bombers
prowling ahead spreading terror and mayhem. This book demonstrates how
the Polish army was not as backward as it is often portrayed and fielded
a tank force larger than that of the contemporary US Army. Its stubborn
defence did give the Germans some surprises and German casualties were
relatively heavy for such a short campaign.