This is the second half of our look at Union intelligence operations and spies during the American Civil War. This episode finishes up the discussion of Col. George Sharpe's Bureau of Military Information and the big influence Col. Sharpe had on intelligence during and after the war. We then introduce several charismatic Union spies--including Richmond socialite Elizabeth Van Lew, former slave Mary Bowser, actress Pauline Cushman, and Canadian master of disguise Sarah Edmonds. We also meet "the Tsar of the Underground"--counter-intelligence specialist Lafayette Baker--and explore his role in the Lincoln assassination.

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