"The "Flying Camp" is a vaguely understood episode of the American Revolution. In May 1776 the Continental Congress authorized the formation of a force of 10,000 militia, conceived by General George Washington as a "mobile reserve" that would both defend the army's garrisons in the Middle States and spread alarm amongst the British. Most, but not all, of the putative organization was to come from the states of New York, Pennsylvania, New Jersey, and...