One of the first American spies was a women during the Revolutionary War. To this day, her identity is not known and is referred to only as Agent 355. She was actually one of George Washington’s personal spies and completely vanished near the end of the war. No one knows if she died mysteriously or secretly retired. She collected crucial information from the British to win the war and, to this day, remains the only unidentified member of the Culper Spy Ring.