Harry Turtledove first came to prominence as a writer of alternate world fantasy with The Misplaced Legion, the first novel in his multibook Videssos Cycle about the experiences of a Roman legion transferred to a world that runs on magic. Since then, he has explored the impact of altered historical events in a variety of works, including Agent of Byzantium, set in medieval times; the acclaimed The Guns of the South, in which time travelers manipulate a southern victory in the American Civil War; and the first two volumes of the Great War saga, American Front and Walk in Hell, which envisions an America in which the United States and the Confederate States support opposing sides in World War I. His ambitious Worldwar series-which includes In the Balance, Tilting the Balance, Striking the Balance, and Upsetting the Balance-projects an alternate World War II in which an alien invasion forges alliances between Axis and Allied opponents. Turtledove has also coedited the anthology Alternate Generals. His many other works include the short-fiction collection Departures, the comic fantasy The Case of the Toxic Spell Dump, and the linked novels Into the Darkness and Darkness Descending, epic tales of empire building set in a fantasy world where cataclysmic wars are fought with magic.