The Battle of Lexington and Concord took place on April 19, 1775, and is significant as the first military engagement of the American Revolutionary War.

This date signifies a crucial turning point in history, as colonial militias confronted British forces in a clash that represented the colonists' defiance against British rule. The battles highlighted the willingness of American colonists to defend their rights and liberties. The expression "the shot heard round the world" is frequently linked to this event, capturing the worldwide importance of the fight for independence that commenced on that day.