Between December 1775 and March 1776, Henry Knox was ordered by General George Washington to do the unthinkable—transport artillery that had been captured at Fort Ticonderoga and Fort George in New York to the Continental Army in the outskirts of Boston in order to drive the occupying British forces out of the important port city. In the middle of winter, Knox found a way to drag fifty-nine cannons 300 miles, crossing Lake Champlain by boat and using teams of horses…