The American Revolutionary War began on April 19, 1775, with the Battles of Lexington and Concord and the Siege of Boston. The colonists were divided over breaking away from British rule and split into two factions: Patriots who rejected British rule, and Loyalists who desired to remain subject to the King. General Thomas Gage was commander of British forces in America at the beginning of the war. Upon hearing the shocking news of the onset of war, Washington was "sobered and dismayed", and he hastily departed Mount Vernon on May 4, 1775, to join the Second Continental Congress in Philadelphia.