At four in the morning on April 19, 1775, a line of British soldiers stared across the village green of Lexington, Massachusetts, at a crowd of seventy-seven American militiamen. A shot rang out, and the Redcoats replied with a devastating volley. But the day that started so well for the king's troops would end in catastrophe: seventy-three British soldiers dead, two hundred wounded, and the survivors chased back into Boston by the angry colonists. Drawing on diaries, letters, official documents, and memoirs, William H. Hallahan vividly captures the drama of those tense twenty-four hours and shows how they decided the fate of two nations.