"And how long do you think that'll last? How long before they work out we blew all our traps stopping them from getting this far? It's not like we can send ponies out there to set more, and we can't do anything to slow them down because of all the griffons. Once they clear those burnt out tanks out of the way, there is nothing stopping them from getting to the wall, and if they get through that, well... that's it, they're in Equestria."