[Gregstrom]

AFAIK:

Morale 30 = only rout when HP loss forces autorout. Does not flee from fear, and unaffected by Awe.
Morale 50 = never rout, mindless. Tends to disintegrate when the rest of the army routs. Immune to fear and awe.
Morale 99 = never rout, berserk. Fights on when the rest of the army routs. Immune to fear and awe.