Lexington and Concord are two historically significant towns in Massachusetts, USA, and are often mentioned together as they were the sites of the first battle of the American Revolutionary War. There are several synonyms for these towns that are commonly used by historians and writers. One of the common synonyms is "the Battle of Lexington and Concord," which refers to the confrontation between British troops and American militia that took place on April 19th, 1775. Other synonyms include "the Shot Heard Round the World," a phrase coined by Ralph Waldo Emerson to refer to the first shot fired in the battle, and "the Midnight Ride of Paul Revere," a term that alludes to the famous ride Revere took to warn the colonists of the approaching British troops before the battle.