Well, at least they admit that they're pillaging and raping. The ironborn have the element of surpirse, Barristan thinks they're on the same side, but they might not. I don't think the 3000+ unsullied are 3000+ anymore. Some died of battle and others of the plague. Not all of them died, I estimate that there are about 1800+ unsullied acting as a reserve inside Mereen.