A rare letter U.S. President Abraham Lincoln sent to one of his top generals at a turning point in the Civil War is expected to sell for $100,000. The handwritten note on presidential stationary was sent to Major General George B. McClellan on October 29, 1862.

McClellan was removed from his duties a week afterwards for failing to aggressively pursue Confederate General Robert E. Lee after the Battle of Antietam a month earlier.

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