alt Hacker NewsIf you have 500 tanks and 500 cardboard tanks, someone with only as many real tanks as you have may not bother attacking. Thus, having the cardboard tanks saved you a battle.
If someone with 1000 tanks attacks, it's a battle you would not have won anyway.
And yet, cardboard tanks have been useful only a handful of times during wartime. Tanks on the other hand have proven their usefulness many times.