[Truper]

I can't recall for certain, but I do not believe the precise mechanics are known. Essentially what happens is that a unit with fear projects a cone-shaped aura of fear out from its location. I believe that enemy units within the aura must make an extra morale check, and I'd guess that the larger the fear number, the more likely enemy troops are to fail the check. Also, the higher the fear number, the larger the aura is.