In mid-May 1775, the American Revolution was barely a month old. Many British soldiers were in Boston, Massachusetts. The American troops were nearby. The next battle could break out at any moment. Fifteen-year-old John Greenwood's parents lived in Boston. But John lived with his uncle 150 miles away. When the war started, he decided to go back to Boston to check on his family. But when he arrived, the British soldiers wouldn't let anyone into the...