They were masters of the craft of illusion and deception, and their greatest disappearing act was to vanish from history. The men of the 23rd Headquarters Special Troops were recruited to become phantom warriors in a ghost army to help win the Battle of Europe. A thousand strong, they fought in more campaigns, from D Day to the Rhine River, with more Allied armies, than any other unit in the European Theater of Operations - yet, not even their fellow American soldiers were aware of their...