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america, united states, us, usa, american, americans, american civil war, us civil war, yankee, yankees, civil war, hanging, gallows, execution, executions, spies, spy, spying, espionage, confederates, south, confederate, confederation, army of the cumberland, cumberland
Heath Robinson, W.
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heath robinson, military history, military historian, military historians, military tactic, military tactics, military strategy, german spy, german spies, carrier pigeon, carrier pigeons, espionage, spy, spies, spying