I read that after the disaster at... I believe it was Red Mountain? Something like that... I read that the leader of the Nordic Armies discovered the Nords had been punished for using the Voice in such a way.
Anyway it goes on to say that the Nordic ability to use the Voice simply faded from use and to this day it is not common anymore.
But this got me thinking... is the Nordic ability to use Battlecry like a lasting effect? Is Battlecry, in a sense, a Shout? That makes sense to me, a lot of sense.