One does not simply walk into Mordor. It's black gates are guarded by more than just orcs. There is evil there that does not sleep. The great eye is ever watchful. It is a barren wasteland, riddled with fire, ash, and dust. The very air you breathe is a poisonous fume. Not with ten thousand men could you do this. It is folly.
~Boromir, The Lord of the Rings