“The Shot Heard ’Round the World” refers to which of the following U.S. military encounters?

On April 18, 1775, Paul Revere and William Dawes warned that the British were coming to arrest Patriot leaders John Hancock and Sam Adams and to confiscate "all stores of weapons and gunpowder" in colonial hands. At dawn the next day, 77 colonial minutemen faced 700 heavily armed British troops on the Lexington Town Green. A single shot rang out. In the ensuing battle, 10 American Patriots lost their lives.

Hours later, having destroyed the Patriot arsenal at Concord, the Redcoats faced unrelenting sniper fire from hundreds of militiamen on their return march to Boston. Patriot casualties from the Battles of Lexington and Concord were less than 100, but the "shot heard 'round the world" sparked the American Revolutionary War.