Haldir, a guard of Lorien
The wardens of Lorien were a group of archers led by Haldir of Lothlórien and was one of the most senior wardens guarding the Golden Wood from attack.
He and his company encounter the the Fellowship when they enter Lothlórien and after talking with them about the conditions for entering the realm; they lead the company to the lord and lady blindfolded.
They wore grey hooded cloaks.
Role in Adaptations
In The Fellowship of the Ring, he and the other Lothlórien archers ambush and question the Eight Walkers, allowing them to enter their land.
In The Two Towers, Galadriel and Celeborn persuaded Elrond that the Men of Rohan, and the race of Men in general, should not be abandoned in their hour of need. With Elrond's permission, Haldir rallied two hundred of the Elves of Lothlórien to join him, and together they marched to Helm's Deep bearing the banners of their Lady Galadriel, arriving just ahead of Saruman's approaching Uruk-hai army.
The elves' involvement in the defense of the Hornburg proved critical in delaying the enemy; as their superior archery and sword skills enabled them to defend the Deeping Wall for a time. Otherwise, the Rohirrim did not have sufficient manpower to cover all of the Hornburg's fortifications and hold out long enough, being forced to supplant their ranks with boys and old men. The elves' sacrifice bought enough time for Gandalf, Eomer and the two thousand mounted Rohirrim horseman to arrive and turn the tide of the battle.
But the price that the elves paid was high indeed: most of them who left Lothlórien including Haldir were slain in the battle. They were buried by the Men of Rohan with honor in the land of their allies. Only a few returned to accompany their kin on that final journey to the Undying Lands.
In Tolkien’s original books, Lórien could not spare any forces to help the other kingdoms against Sauron. Lórien barely survived three assaults from Dol Guldur.