April 19: How It Began and Ended | American Experience | Official Site
Patriots Day | Article April 19: How It Began and Ended April 19: How It Began:
On April 18, 1775, Dr. Joseph Warren saw the British regulars mobilizing in Boston. He suspected the soldiers would soon be sent after the leaders of the illegal Provincial Congress, Samuel Adams and John Hancock, who were staying in Lexington, a town across the Charles River and to the west. Warren, the highest ranking member of the Whigs left in Boston, confirmed this information with an unnamed British source, and sent for two messengers.
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