The Guns of the South

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The Guns of the South is an alternate history novel set during the American Civil War by Harry Turtledove. It was released in the United States on September 22, 1992.
The story deals with a group of time-travelling white supremacist members of the Afrikaner Weerstandsbeweging from an imagined 21st-century South Africa, who supply Robert E. Lee's Army of Northern Virginia with AK-47s and small amounts of other supplies. Their intervention and technologies results in a Confederate victory in the war.