Deception has been a part of warfare since the Trojan horse. During WWII, it became high art. Members of the 23rd Headquarters Special Troops used special “weapons” like dummy planes, tanks, antiaircraft guns, and amplified recordings that created war sounds to fool the German high command. To enable a combat unit to change positions or even attack when the Germans thought it hadnt moved at all, the 1800 men of the 23rd impersonated entire divisions. They would move in at night, change insignias, and inflate their rubber decoys. Meanwhile, the troops they were replacing sneaked away. Such deception was a major factor in the success of the Allies D-Day invasion, as the German 15th Army waited elsewhere for an assault that never came.