Civil War Spies
The Civil War was the first war where spying was used on a large scale and became an art. It is an interesting fact that the brightest and the best were young females. There were male spies, but none of them were as successful as the female spies. Three of the very best spies were Rose O'Neal Greenhow, Emma Edmonds, Bell Boyd. All three of these spies helped their side get information about the other sides' war tactics. Spying during the Civil War lead to what is now known as tactical espionage.