Helm's Deep
Later, on the march to Helm's Deep, Aragorn is injured fighting Orcs on Wargs, falls off a cliff into a river, and is carried downstream. Brego then comes to the wounded Aragorn and lies down on the beach next to him so Aragorn can climb onto its back. He carries him the rest of the way to Helm's Deep. This side story does not exist in the book. Aragorn rides Brego in the charge out of Helm's Deep and to the Rohirrim camp at Dunharrow, but Brego runs away and refuses to enter the Paths of the Dead. It is unclear if the horse Aragorn rides to the Black Gate is Brego, though it has similar coloration.