The American Revolution sharply divided families and towns on Long Island. Washington's defeat at the Battle of Long Island in August 1776 started seven years of British occupation.

Patriot sympathizers were subject to loyalty oaths, theft of property and the quartering of soldiers in their homes. Those who crossed the British were jailed on prison ships in Wallabout Bay in Brooklyn, where an estimated eleven thousand people died of disease and starvation. Some fought back with acts of sabotage and espionage. Washington's famed Culper spy ring in Oyster Bay, Setauket and other areas successfully tracked British movements. Dr. Joanne S. Grasso explores the story of an island at war.