The Ents had attacked Isengard as soon as the army set out for Helm's Deep, and Treebeard and the others quickly reduced the walls to rubble. From Orthanc, his tower, Saruman sent fires out of the ground to burn the Ents, but they diverted the river Isen and drowned the entire area. Saruman is now trapped in the tower, which the Ents cannot damage. Gandalf arrived in the night to ask for the trees to be sent to Helm's Deep, much to the hobbits' surprise. The next day Wormtongue arrived, dismayed by the destruction, but Treebeard allowed him to join Saruman in the tower. Merry and Pippin found a stash of food and pipeweed in the guardhouse and took up their post to await the return of Gandalf with the king.
After lunch, the friends join Gandalf and Théoden to confront Saruman. Gandalf warns them that Saruman's voice can enchant, so they must be wary. Saruman appears in a robe of rainbow colors, and he speaks so reasonably and fairly that everyone feels sorry for him, forgetting that he attacked first. The watchers expect Théoden to side with Saruman, but the king resists the spell. Gandalf offers Saruman a chance to repent and go free, but the wizard's pride refuses. Gandalf breaks his staff and with it the spell of his voice. Wormtongue throws a crystal ball at Saruman's head, missing completely, which Pippin fetches before it rolls into the water. Gandalf quickly takes it, remarking that the stone is probably the most valuable item in Orthanc. As they leave Isengard, Gandalf asks the Ents to watch Saruman and continue flooding the valley.
On the ride back to Edoras, Pippin becomes obsessed with looking again at the stone from Isengard. He steals it from Gandalf that night and uncovers it. When he cries out and collapses, Gandalf revives him and interrogates him. The stone, known as a palantìr, allows communication across distances, and Pippin found himself speaking to the Dark Lord himself. Fortunately, Sauron did not learn of Frodo's quest because he assumed that Pippin is the Ringbearer and is imprisoned in Orthanc. Gandalf leaves the stone with Aragorn and rides immediately with Pippin to Minas Tirith.
