Theoden decides to accompany Gandalf to Isengard for a last parley with Saruman; the wizard has done him great harm and he wishes to see how Gandalf will treat with him in the aftermath of Helm's Deep. Theoden chooses Eomer and 20 men to go with him, and Aragorn, Legolas, and Gimli go with Gandalf The ride offers a short respite from battle, and a chance to mourn the dead. Among these is Hama, Theoden's Captain of the Guard, and the King pauses to cast the first earth on his grave. On the way the travelers actually ride through the forest of the Huorns, which fascinates Legolas. He and Gimli engage in an animated discussion of the merits of Fangorn Forest as compared with the Caves of Aglarond under Helm's Deep, and make their famous bargain to travel together after the Ring War to visit these places. As they leave the wood behind, the riders see their first Ents, a foretaste of what they will find at Isengard. At this point, only Gandalf understands what has happened there.
All along the rest of the road to Isengard, the party sees the unrelieved desolation that Saruman has made of a place once beautiful--all that was green and good has fallen to the creation of his battle engines. But during the night hours, Nature begins to take her own back. Theoden's camp beside the ruin of the Isen River lies on the path the Huorns will take back to Fangorn, and their moving shadows and whispered voices pass on either side of the riders in the darkness. The fear that Tolkien's moving wood engenders makes its counterpart in Shakespeare's Macbeth seem quite tame indeed.