A few days ago I sent my 200 men strong pythium army consisting of the Hastatus (sp?) unit against a AI tienīchi army consisting of the Master with iron crutch (ethereal, spamming a AOE fear spell) and 30 units of random trash.
My entire army routed into enemy occupied territory
and that was with one enemy spamming fear. Right now I am preparing a little surprise fear attack against my friend, lets see if it works as well against him.
One noteworthy things is that I lost zero units so fear must be doing something with your moral.