They now formed in marching order and proceeded to advance up the slope of the hill, but had not gone far when before them rose a wall of steel, the surface of which was thickly covered with sharp, gleaming points resembling daggers. The wall completely surrounded the wicker castle, and its sharp points prevented anyone from climbing it. Even the Patchwork Girl might be ripped to pieces if she dared attempt it. "Ah!" exclaimed the Wizard cheerfully, "Ugu is now using one of my own tricks against me. But this is more serious than the Barrier of Fire, because the only way to destroy the wall is to get on the other side of it."

"How can that be done?" asked Dorothy.

The Wizard looked thoughtfully around his little party, and his face grew troubled. "It's a pretty high wall," he sadly remarked. "I'm pretty sure the Cowardly Lion could not leap over it."

"I'm sure of that, too!" said the Lion with a shudder of fear. "If I foolishly tried such a leap, I would be caught on those dreadful spikes."