"The Ents are safe," said Pippin. "He seems at one time to have got round them, but never again. And anyway he did not understand them; and he made the great mistake of leaving them out of his calculations. He had no plan for them, and there was no time to make any, once they had set to work. As soon as our attack began, the few remaining rats in Isengard started bolting through every hole that the Ents made. The Ents let the Men go, after they had questioned them, two or three dozen only down at this end. I don't think many orc-folk, of any size, escaped. Not from the Huorns: there was a wood full of them all round Isengard by that time, as well as those that had gone down the valley.
"When the Ents had reduced a large part of the southern walls to rubbish, and what was left of his people had bolted and deserted him, Saruman fled in a panic. He seems to have been at the gates when we arrived: I expect he came to watch his splendid army march out. When the Ents broke their way in, he left in a hurry. They did not spot him at first. But the night had opened out, and there was a great light of stars, quite enough for Ents to see by, and suddenly Quickbeam gave a cry "The tree-killer, the tree-killer!" Quickbeam is a gentle creature, but he hates Saruman all the more fiercely for that: his people suffered cruelly from orc-axes. He leapt down the path from the inner gate, and he can move like a wind when he is roused. There was a pale figure hurrying away in and out of the shadows of the pillars, and it had nearly reached the stairs to the tower-door. But it was a near thing. Quickbeam was so hot after him, that he was within a step or two of being caught and strangled when he slipped in through the door.
"When Saruman was safe back in Orthanc, it was not long before he set some of his precious machinery to work. By that time there were many Ents inside Isengard: some had followed Quickbeam, and others had burst in from the north and east; they were roaming about and doing a great deal of damage. Suddenly up came fires and foul fumes: the vents and shafts all over the plain began to spout and belch. Several of the Ents got scorched and blistered. One of them, Beechbone I think he was called, a very tall handsome Ent, got caught in a spray of some liquid fire and burned like a torch: a horrible sight.
"That sent them mad. I thought that they had been really roused before; but I was wrong. I saw what it was like at last. It was staggering. They roared and boomed and trumpeted, until stones began to crack and fall at the mere noise of them. Merry and I lay on the ground and stuffed our cloaks into our ears. Round and round the rock of Orthanc the Ents went striding and storming like a howling gale, breaking pillars, hurling avalanches of boulders down the shafts, tossing up huge slabs of stone into the air like leaves. The tower was in the middle of a spinning whirlwind. I saw iron posts and blocks of masonry go rocketing up hundreds of feet, and smash against the windows of Orthanc. But Treebeard kept his head. He had not had any burns, luckily. He did not want his folk to hurt themselves in their fury, and he did not want Saruman to escape out of some hole in the confusion. Many of the Ents were hurling themselves against the Orthanc-rock; but that defeated them. It is very smooth and hard. Some wizardry is in it, perhaps, older and stronger than Saruman's. Anyway they could not get a grip on it, or make a crack in it; and they were bruising and wounding themselves against it. "So Treebeard went out into the ring and shouted. His enormous voice rose above all the din. There was a dead silence, suddenly. In it we heard a shrill laugh from a high window in the tower. That had a queer effect on the Ents. They had been boiling over; now they became cold, grim as ice, and quiet. They left the plain and gathered round Treebeard, standing quite still. He spoke to them for a little in their own language; I think he was telling them of a plan he had made in his old head long before. Then they just faded silently away in the grey light. Day was dawning by that time.
"They set a watch on the tower, I believe, but the watchers were so well hidden in shadows and kept so still, that I could not see them. The others went away north. All that day they were busy, out of sight. Most of the time we were left alone. It was a dreary day; and we wandered about a bit, though we kept out of the view of the windows of Orthanc, as much as we could: they stared at us so threateningly. A good deal of the time we spent looking for something to eat. And also we sat and talked, wondering what was happening away south in Rohan, and what had become of all the rest of our Company. Every now and then we could hear in the distance the rattle and fall of stone, and thudding noises echoing in the hills.
"In the afternoon we walked round the circle, and went to have a look at what was going on. There was a great shadowy wood of Huorns at the head of the valley, and another round the northern wall. We did not dare to go in. But there was a rending, tearing noise of work going on inside. Ents and Huorns were digging great pits and trenches, and making great pools and dams, gathering all the waters of the Isen and every other spring and stream that they could find. We left them to it.
"At dusk Treebeard came back to the gate. He was humming and booming to himself, and seemed pleased. He stood and stretched his great arms and legs and breathed deep. I asked him if he was tired.
"Tired?" he said, "tired? Well no, not tired, but stiff. I need a good draught of Entwash. We have worked hard; we have done more stone-cracking and earth-gnawing today than we have done in many a long year before. But it is nearly finished. When night falls do not linger near this gate or in the old tunnel! Water may come through-and it will be foul water for a while, until all the filth of Saruman is washed away. Then Isen can run clean again." He began to pull down a bit more of the walls, in a leisurely sort of way, just to amuse himself.
"We were just wondering where it would be safe to lie and get some sleep, when the most amazing thing of all happened. There was the sound of a rider coming swiftly up the road. Merry and I lay quiet, and Treebeard hid himself in the shadows under the arch. Suddenly a great horse came striding up, like a flash of silver. It was already dark. but I could see the rider's face clearly: it seemed to shine, and all his clothes were white. I just sat up, staring, with my mouth open. I tried to call out, and couldn't.
"There was no need. He halted just by us and looked down at us. "Gandalf!" I said at last. but my voice was only a whisper. Did he say: "Hullo, Pippin! This is a pleasant surprise!"? No, indeed! He said: "Get up, you tom-fool of a Took! Where, in the name of wonder, in all this ruin is Treebeard? I want him. Quick!"
"Treebeard heard his voice and came out of the shadows at once; and there was a strange meeting. I was surprised, because neither of them seemed surprised at all. Gandalf obviously expected to find Treebeard here; and Treebeard might almost have been loitering about near the gates on purpose to meet him. Yet we had told the old Ent all about Moria. But then I remembered a queer look he gave us at the time. I can only suppose that he had seen Gandalf or had some news of him, but would not say anything in a hurry. "Don't be hasty" is his motto; but nobody, not even Elves, will say much about Gandalf's movements when he is not there.