1775 April 18, 1775: Two lanterns are lit in the Old North Church steeple to indicate the British are crossing the Charles River, and Paul Revere begins his ride. April 19, 1775: Battle of Lexington, won by the British April 19, 1775: At the Battle of Concord the Americans introduce the British to guerilla warfare April 19, 1775 to March 17, 1776: Siege of Boston: 15,000 Minutemen laid siege to Boston from April 19, 1775 until March 17, 1776, when the British troops withdrew. May 10, 1775: The Second Continental Congress convenes in Philadelphia and remains in session throughout the war. May 10, 1775: First Battle of Ticonderoga June 17, 1775: Battle of Bunker Hill September 17 to November 3, 1775: Siege of Fort St. Jean November 4, 1775: Battle of Kemp's Landing