Good questions. I have no idea.
I've never heard of this particular stratagem being used, and I don't think it's listed in any army in Books 2 or 3. I'd be almost willing to bet there are no armies in Book 1 which use it either. I'd be interested to know whether any armies in Book 4 will get it.
In other words, I have a sneaky suspicion it's never going to appear.