Disclaimer: Kim Possible, Ron Stoppable and Rufus are owned by Disney Corporation* and created by super-intelligent beings from another galaxy, whose Earthly identities are Mark McCorkle and Bob Schooley. All other characters (and all imagined locations) are owned by Alan Garner, apart from those from those created by his grandfather or sourced from ancient British mythology. Real-life locations used are owned by some combination of the National Trust, English Heritage and possible descendants of a druid sect. All else is a combination of my rather deranged imagination after far too much coffee.
*Disney Corporation might well have also been created by super-intelligent beings from another galaxy and are kindly asked to not point those super-disruptor laser cannons in my direction.
Once upon a time a farmer from Mobberley, mounted on a milk-white horse, was crossing the Edge on his way to Macclesfield to sell the animal. He had reached a spot known as the Thieves' Hole, and, as he slowly rode along thinking of the profitable bargain which he hoped to make, was startled by the sudden appearance of an old man, tall and strangely clad in a deep flowing garment.
The old man ordered him to stop, told him that he knew the errand upon which the rider was bent, and offered a sum of money for the horse. The farmer, however, refused the offer, not thinking it sufficient. "Go, then, to Macclesfield," said the old man, "but mark my words, you will not sell the horse. Should you find my words come true, meet me this evening, and I will buy your horse."
The farmer laughed at such a prophecy, and went on his way. To his great surprise, and greater disappointment, nobody would buy, though all admired his beautiful horse. He was, therefore, compelled to return. On approaching the Edge he saw the old man again.
Checking his horse's pace, he began to consider how far it might be prudent to deal with a perfect stranger in so lonely a place. However, while he was considering what to do, the old man commanded him, "Follow me!"
Silently the old man led him by the Seven Firs, the Golden Stone, by Stormy Point, and Saddle Boll. Just as the farmer was beginning to think he had gone far enough he fancied that he heard a horse neighing underground. Again he heard it.
Stretching forth his arm the old man touched a rock with a wand, and immediately the farmer saw a ponderous pair of iron gates, which, with a sound like thunder, flew open. The horse reared bolt upright, and the terrified farmer fell on his knees praying that his life might be spared. "Fear nothing," spoke the Wizard, "and behold a sight which no mortal eye has ever looked upon."
They went into the cave. In a long succession of caverns the farmer saw a countless number of men and horses, the latter milk-white, and all fast asleep.
In the innermost cavern heaps of treasure were piled up on the ground. From these glittering heaps the old man bade the farmer take the price he desired for his horse, and thus addressed him: "You see these men and horses; the number was not complete. Your horse was wanted to make it complete. Remember my words, there will come a day when these men and these horses, awakening from their enchanted slumber, will descend into the plain, and in a battle thrice lost and thrice won will drive the enemy into the sea. Go home in safety. Leave your horse with me. No harm will befall you; but henceforward no mortal eye will ever look upon the iron gates. Begone!"
The farmer lost no time in obeying. He heard the iron gates close with the same fearful sounds with which they were opened, and made the best of his way to Mobberley. Despite searching many times, neither he nor any other person ever saw the gates again, save Nell Beck and they said she was mad.