The American Revolution-and thus the history of the United States-began not on land but on the sea. Paul Revere began his famous midnight ride not by jumping on a horse, but by scrambling into a skiff with two other brave patriots to cross Boston Harbor to Charlestown. Revere and his companions rowed with muffled oars to avoid capture by the British warships closely guarding the harbor. As they paddled silently, Revere's neighbor was flashing two...