Maybe that they helped the Rohirrim.
The chieftains by keeping watch over the northwest of Rohan and by keeping any evil Dunlanders out (at least for a while) and Galadriel by providing Eorl and his host with a protective cloud of mist so they could pass unseen near Dol Guldur.
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“The invisible and the non-existent look very much alike.”
Delos B. McKown
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