Espionage was big business during the American Civil War. Both sides had thousands of spies including hundreds of women. Many of the spy rings were located in each of the capital cities, Washington D. C. and Richmond, sending valuable information back to their respective governments, and each side had a number of independent spies working for them. Some of these independent spies were under contract, but others did their dangerous work out of love for their country. To be sure, it was a very...