Along with its massive field campaigns, World War II also played host to an underground brand of warfare that included espionage, sabotage, disinformation and special operations behind enemy lines. These cloak-and-dagger tactics resulted in some of the most ingenious and unconventional missions of the war, and played a vital role in the outcome of several major battles. From the spy that never was to a band of Nazi impostors, learn the stories behind five of the boldest and most bizarre special operations carried out during World War II.