A book about the Civil War conflict in Gettysburg has won a $US50,000 ($A55,199) prize.
Allen C Guelzo's Gettysburg: The Last Invasion has received the inaugural Guggenheim-Lehrman Prize in Military History.
The prize's sponsors made the announcement on Tuesday.
The award was established last year by the Harry F Guggenheim Foundation and Lewis E Lehrman, a businessman, former Republican candidate for governor and co-founder of the Gilder-Lehrman Institute of American History.
Among the five other finalists were The Guns at Last Light, the finale of Rick Atkinson's acclaimed World War II trilogy.
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