The first battle fought between the United States and Britain during the Revolutionary War was the Battle of Lexington and Concord, which took place on April 19, 1775. This confrontation marked the outbreak of armed conflict between colonial militias and British troops aiming to seize colonial military supplies. Known for the phrase “the shot heard 'round the world,” the battles galvanized the colonies to unite against British rule, symbolizing the fight for independence. This initial clash set the tone for subsequent battles and played a crucial role in rallying support for the American Revolution, making it a pivotal moment in U.S. history.