War and Peace is a literary work mixed with chapters on history and philosophy by the Russian author Leo Tolstoy. It was first published serially, then published in its entirety in 1869. It is regarded as one of Tolstoy's finest literary achievements and remains an internationally praised classic of world literature. Book 14: 1812: The Battle of Borodinó, with the occupation of Moscow that followed it and the flight of the French without further conflicts, is one of the most instructive phenomena in history. All historians agree that the external activity of states and nations in their conflicts with one another is expressed in wars, and that as a direct result of greater or less success in war the political strength of states and nations increases or decreases.