Read the
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Danerys dream sequences
In whatever book they happen again, then, bearing in mind the imagery used, look for references to the same things regarding other characters in all five books. It bears out.
Or, you could just do a Google of this stuff using the appropriate words, but I'd leave that until you've finished "Dance". It's being raked and re-raked like a zen garden on the forums, and those tend to be full of spoilers.
Question for you though...
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Q: What would they need at the Wall to not only repel the Others, but man the wall for the forseeable future, given the amount of fighting men Wezteros has lost in the War of the Numerous Silly Kings?
A: The Unsullied.
"Mind control my Dragon and I'll give you a million eunuch badasses who do what they're told (and a blowjob)"