Dr. Joseph Warren was an American doctor and leader of the Patriot forces ("Sons of Liberty") opposing the British actions in the Massachusetts Bay Colony in the months preceding the American Revolution. As intelligence reports came in indicating that a British attack on Patriot weapon stores in Lexington and Concord was imminent, he had the authority to give the order to fight back militarily. On the evening of April 18, 1775, the intelligence reports became unmistakable that the British operation would commence the next day, and he gave the order that started the Revolution. Word was sent out to the Patriot forces in triplicate, according to a carefully laid out and well executed plan. Paul Revere and William Dawes went out through the British cordon by two different routes, and the famous lantern signal was sent out from Old North Church.
Two months later, Warren died in the Battle of Bunker Hill.