Ok I misled you again.
So to summurise.
You can not cast fanaticism twise.
You can't affect enemy units with weapons of sharpness coz there is friendly in the description.
You can however affect them with quickness and give them +3 att/def.
Strength of giants doesn't affect enemy units. even though it doesn't have fiendly in its description.
Wooden Warriors doesn't affect enemy units either.
Also legions of steel acts wierd in the fact that the mage didn't seem to like casting it if it will affect enemies. But needs some furhter tests.
P.s Completely ignore the crap I said before. i was talking on memory about the weapons so I was under the impression that I've seen it affect enemies IT DOES NOT.
P.P.s. I think its similar with destructon you can affect allied troops