I believe a lot retreated to the woods where they were crushed by the Huorns and the Ents...at least after the battle of Helm's Deep. I'm pretty sure many did still retreat to the woods after the fall of Sauron, and they were either consumed by the Ents/Huorns or the soldiers of Gondor. This is all speculation however, I have no evidence...pure speculation.
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"Loud and clear it sounds in the valleys of the hills...and then let all the foes of Gondor flee!" -Boromir, The Fellowship of the Ring
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