During the critical Battle of Oriskany in August 1777, Continental forces led by General Nicholas Herkimer defeated the British army under St. Leger in the heart of New York's Mohawk Valley. It was a hard-won victory, but he and his brave troops prevented the British from splitting the colonies in two. Although they did not succeed in relieving the British siege of Fort Stanwix, Herkimer's citizen-soldiers turned back the British and protected Washington's northern flank from attack. The Continental army survived to fight the decisive Battle of Saratoga the next month. Herkimer was mortally...