New York City officials are planning for a Dunkirk-like evacuation of Manhattan island in the case of an emergency. In the early days of World War II, a "bathtub navy" was assembled between Dunkirk, France and Dover, England, in order to move hundreds of thousands of soldiers from the Continent to safer ground as the Nazis advanced across France. Hundreds of small craft were sent across the English Channel to ferry stranded and cornered British......