In August 1776, a little over a month after the Continental Congress had formally declared independence from Britain, the revolution was on the verge of a sudden and disastrous end. General George Washington found his troops outmanned and outmaneuvered at the Battle of Brooklyn, and it looked like there was no escape. But thanks to a series of desperate rear guard attacks by a single heroic regiment, famously known as the "Immortal 400," Washington...