LEXINGTON and CONCORD "The shot heard 'round the world" Over 700 Redcoats marched through the night of April 18, 1775, reaching Lexington near dawn. Awaiting them were 77 Minutemen - farmers and laborers trained to be "ready in a minute." One musket went off. Historians still debate which side fired the first shot, but within seconds, eight colonists lay dead on Lexington Green. On to Concord, 400 Minutemen exchanged gunfire with 120 Redcoats at the North Bridge. Pealing church bells spread the alarm and colonial numbers grew to 5,000. The British would have been massacred, but reinforcements arrived as they fled back to Boston. April 19, 1775 … the war had begun!