In the play as for Battering Ram it says:
Special Ability: If three or more Evil Characters are in battle, discard one O.T. Fortress site. Ability cannot be prevented or negated. Play As: When three or more Evil Characters are in battle, discard one O.T. Fortress. Ability cannot be prevented or negated. Characters in the Fortress are returned to territory. •
Why would it return the evil characters to territory? That is not part of the ability and default rules say that the characters would be discarded.