Twink and Tom knew the story, too. They had read how the Nome King, seeking revenge on Ozma and Dorothy because they had once conquered him, set his Nomes to burrowing a tunnel from the Nome Kingdom to the Emerald City. When it was finished, Roquat the Red (as the Nome King was known then) and a horde of evil allies marched through the tunnel, intent on conquering and laying waste all of Oz. Ozma refused to fight, but instead gathered all her closest friends about her in the garden near the Fountain of Oblivion, where the invaders were about to break through from the tunnel. The famous Scarecrow of Oz had given Ozma the idea that had saved her from the necessity of fighting. The tunnel was hot and dry, and Ozma had used her magic powers to scatter dust through the underground passage. As a result, when the Nome King and his allies came bursting through the earth they were consumed with a terrible thirst. The first thing they saw was the Fountain of Oblivion. Just as the Scarecrow had planned, they all dashed to the fountain and drank. The waters of this fountain cause anyone who drinks of it to lose all memory of his former life. Consequently the Nome King and all his allies became as harmless as little children, having forgotten their former evil lives. Ozma had sent them back by means of the Magic Belt to their own lands, and then closed the earth over the tunnel's entrance into her garden. Soon after that Glinda had laid down the Magic Barrier of Invisibility over the Deadly Desert, which Ozma hoped would prevent any other invaders from attacking the Land of Oz. "Trying to get through the tunnel really seems the only thing to do," said the Shaggy Man thoughtfully. "That will be far better than just sitting and waiting for Ozma to return to the Emerald City--I have no idea how long she plans to visit with Glinda. I suppose the only thing we can do is try to deal with the Barrier of Invisibility when we come to it. Perhaps your Majesty's magic could overcome it?" The Beaver King was thoughtful. "Perhaps," he said. "But you must remember Glinda's magic is very powerful. We may discover that the desert is just as impassable underground as it is above ground. So don't let us raise our hopes too high, my friends. At any rate," he concluded, "we will undertake the journey in the morning, and then we shall know." The beaver King led his guests into his throne room where comfortable seats were provided. Next a troop of beaver acrobats came running into the throne room. They wore brightly colored tights and put on a performance of such skill and daring that Twink and Tom were delighted. The animals were amazingly agile and some of their tumbling tricks were so droll that even Twiffle laughed aloud. "I never saw anything to beat this at the circus," Tom confided to Twink as the twins loudly applauded.