" Then followed an incredible tactical blunder. With the British expeditionary force helplessly retreating toward the sea, but far behind in the race and about to be cut off by Guderian’s massed tanks, the Führer halted Guderian on the River Aa, nine miles from Dunkirk, and forbade the tank divisions to advance for three days! To this day nobody has factually ascertained why he did this. Theories are almost as abundant as military historians, but they add little to the facts. During these three days the British rescued their armies from the Dunkirk beaches. That is the long and short of the “miracle of Dunkirk. "

― Herman Wouk , The Winds of War (The Henry Family, #1)