Johnny Tremain, a 1943 children's novel by Esther Forbes, retells in narrative form the final years in Boston prior to the outbreak of the American Revolution. The novel's themes include the apprenticeship system, the conflicts in Boston between the Sons of Liberty and Loyalists as the war approaches, and the reasons why each character in the novel chooses one side or the other. Events that were described in the novel include the Boston Tea Party, the British blockade of the Port of Boston, the midnight ride of Paul Revere, and the Battles of Lexington and Concord. The book won the 1944 Newbery Medal and is the 16th bestselling children's book as of the year 2000 in the United States, according to Publishers Weekly. A film adaptation, also called Johnny Tremain, was made in 1957 by Walt Disney Pictures.