But even as they retreated, and before Pippin and Merry had reached the stair outside, a huge orc-chieftain, almost man-high, clad in black mail from head to foot, leaped into the chamber; behind him his followers clustered in the doorway. His broad flat face was swart, his eyes were like coals, and his tongue was red; he wielded a great spear. With a thrust of his huge hide shield he turned Boromir's sword and bore him backwards, throwing him to the ground. Diving under Aragorn's blow with the speed of a striking snake he charged into the Company and thrust with his spear straight at Frodo. The blow caught him on the right side, and Frodo was hurled against the wall and pinned. Sam, with a cry, hacked at the spear-shaft, and it broke. But even as the orc flung down the truncheon and swept out his scimitar, Anduril came down upon his helm. There was a flash like flame and the helm burst asunder. The orc fell with cloven head. His followers fled howling, as Boromir and Aragorn sprang at them.
'Now!' shouted Gandalf. 'Now is the last chance. Run for it!'
Aragorn picked up Frodo where he lay by the wall and made for the stair, pushing Merry and Pippin in front of him. The others followed; but Gimli had to be dragged away by Legolas: in spite of the peril he lingered by Balin's tomb with his head bowed. Boromir hauled the eastern door to, grinding upon its hinges: it had great iron rings on either side, but could not be fastened.
'I am all right,' gasped Frodo. 'I can walk. Put me down!'
Aragorn nearly dropped him in his amazement. 'I thought you were dead!' he cried.
'Not yet!' said Gandalf. 'But there is time for wonder. Off you go, all of you, down the stairs! Wait a few minutes for me at the bottom, but if I do not come soon, go on! Go quickly and choose paths leading right and downwards.'
'We cannot leave you to hold the door alone!' said Aragorn.
'Do as I say!' said Gandalf fiercely. 'Swords are no more use here. Go!'
The passage was lit by no shaft and was utterly dark. They groped their way down a long flight of steps, and then looked back; but they could see nothing, except high above them the faint glimmer of the wizard's staff. He seemed to be still standing on guard by the closed door. Frodo breathed heavily and leaned against Sam, who put his arms about him. They stood peering up the stairs into the darkness. Frodo thought he could hear the voice of Gandalf above, muttering words that ran down the sloping roof with a sighing echo. He could not catch what was said. The walls seemed to be trembling. Every now and again the drum-beats throbbed and rolled:
Suddenly at the top of the stair there was a stab of white light. Then there was a dull rumble and a heavy thud. The drum-beats broke out wildly:
'Well, well! That's over!' said the wizard struggling to his feet. 'I have done all that I could. But I have met my match, and have nearly been destroyed. But don't stand here! Go on! You will have to do without light for a while: I am rather shaken. Go on! Go on! Where are you, Gimli? Come ahead with me! Keep close behind, all of you!'
They stumbled after him wondering what had happened.
At the end of an hour they had gone a mile, or maybe a little more, and had descended many flights of stairs. There was still no sound of pursuit. Almost they began to hope that they would escape. At the bottom of the seventh flight Gandalf halted.
'It is getting hot!' he gasped. 'We ought to be down at least to the level of the Gates now. Soon I think we should look for a left-hand turn to take us east. I hope it is not far. I am very weary. I must rest here a moment, even if all the orcs ever spawned are after us.'
Gimli took his arm and helped him down to a seat on the step. 'What happened away up there at the door?' he asked. 'Did you meet the beater of the drums?'
'I do not know,' answered Gandalf. 'But I found myself suddenly faced by something that I have not met before. I could think of nothing to do but to try and put a shutting-spell on the door. I know many; but to do things of that kind rightly requires time, and even then the door can be broken by strength.