Come on, the broken front is one of the most cliche "misunderstandings" to prop up bad writing in the history of story telling. The horde was about to go down and they sounded the horn which also alerted the alliance, this was simple not a winnable situation. That no one has even suggest something like this so far to the alliance is just laughable. Another guy dug up the perfect word for it, it's an idiot plot.
The other two are obviously correct, Theramore certainly. Even though Southshore in relation to Teldrassil is like nuking some backwater village in idaho compared to nuking NYC.