The first day of the war began with a lopsided battle on Lexington Green in response to a British expedition to seize colonial arms. It ended with British-occupied Boston being surrounded by thousands of colonial militiamen. While it is the Battles of Lexington and Concord that are most remembered, more men were killed or wounded during the British retreat from Concord to Boston than in the battles themselves.
Memorial to the Lexington Minute Men of 1775 [Lexington, MA]