Sam : Who are they?
Gollum : Wicked men. Servants of Sauron. They are called to Mordor. The Dark One is gathering all armies to him. It won't be long now. He will soon be ready.
Sam : Ready to do what?
Gollum : To make his war. The last war that will cover all the world in shadow.
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From: The Lord of the Rings: The Two Towers (2002)