So Dickie went down on his hands and knees, and crept down the mole tunnel of soft, sweet-smelling earth, and then along, and then up--and there they were in the courtyard. There, too, were Edred and Elfrida. The three children hugged each other, and then turned to the Mouldiwarp. "How can we get home?" "The old way," he said; and from the sky above a swan carriage suddenly swooped. "In with you," said the Mouldiwarp; "swan carriages can take you from one time to another just as well as one place to another. But we don't often use 'em--'cause why? swans is dat contrary dey won't go invisible not for no magic, dey won't. So everybody can see 'em. Still we can't pick nor choose when it's danger like dis 'ere. In with you. Be off with you. This is the last you'll see o' me. Be off afore the soldiers sees you." They squeezed into the swan carriage, all three. The white wings spread and the whole equipage rose into the air unseen by any one but a Roundhead sentinel, who with great presence of mind gave the alarm, and was kicked for his pains, because when the guard turned out there was nothing to be seen. The swans flew far too fast for the children to see where they were going, and when the swans began to flap more slowly so that the children could have seen if there had been anything to see, there was nothing to be seen, because it was quite dark. And the air was very cold. But presently a light showed ahead, and next moment there they were in the cave, and stepped out of the carriage on the exact spot where Dickie had set out the moon-seeds and Tinkler and the white seal. The swan carriage went back up the cave with a swish and rustle of wings, and the children went down the hill as quickly as they could--which was not very quickly because of Dickie's poor lame foot. The boy who had killed a Cromwell's man with his little sword had not been lame. Arrived in the courtyard, Dickie proudly led the way and stooped to examine the stones near the ruined arch that had been the chapel door. Alas! there was not a sign of the inscription which Dickie had scratched on the stone when the Roundheads were battering at the gates of Arden Castle. Then Edred said, "Aha!" in a tone of triumph. "_I_ took notice, too," he explained. "It's the fifth stone from the chapel door under the little window with the Arden arms carved over it. There's no other window with that over it. I'll get the cold chisel." He got it, and when he came back Dickie was on his knees by the wall, and he had dug with his hands and uncovered the stone where he had scratched with the nails. And there was the mark--19. R.D. 08. Only the nail had slipped once or twice while he was doing the 9, so that it looked much more like a five--15. R.D. 08. "There," he said, "that's what I scratched!" "That?" said Edred. "Why, that's always been there. We found that when we were digging about, trying to find the treasure. Quite at the beginning, didn't we, Elf?"