Dorne was doing guerrilla tactics protecting their homelands from a conqueror. An army from Dorne trying to attack King's Landing against Aegon would have lasted all of 1 and a half seconds. It's akin to ISIS against the USA. Yeah, sure maybe USA can't finish off ISIS and control the area, but no one is afraid of the USA being invaded and conquered by ISIS.
Similar, the army of the dead rushing against the wall (or if it's gone by then, whatever area it's mass attacking) would stand no chance against one dragon, not unless they pull out a trick we haven't seen yet.
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