The Hudson River Valley, which George Washington referred to as the "Key to the Northern Country," played a central role in the American Revolution. From 1776 to 1780, with major battles fought at Saratoga, Fort Montgomery, and Stony Point, the region was a central battleground of the Revolution. In addition, it witnessed some of the most dramatic and memorable aspects of the war, such as Benedict Arnold's failed conspiracy at West Point, the burning...