It was the bloodiest battle ever in the Western Hemisphere. For 3 days in July 1863 Americans slaughtered each other on a terrible scale around a small town in Pennsylvania, where the honored dead "gave the last full measure of devotion". Find out why Robert E. Lee invaded the north, and why he failed so terribly; why the civil war dragged on for almost two more years after this union victory; and how this conflict inspired one of the greatest speeches ever in the English language.