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Wet Magic A splendid captain of Cockles, six feet high if he was an inch, with a sergeant and six men, led the way. Three Oyster officers followed, then a company of Oysters, the advance guard. At the head of the main body following were the Princess and her Staff. As they went the Princess explained why the tunnel was so long and sloped so steeply.

"You see," she said, "the inside of our wall is only about ten feet high, but it goes down on the other side for forty feet or more. It is built on a hill. Now, I don't want you to feel obliged to come out and fight. You can stay inside and get the shields ready for us to take. We shall keep on rushing back for fresh weapons. Of course the tunnel's much too narrow for the Under Folk to get in, but they have their regiment of highly trained Sea Serpents, who, of course, can make themselves thin and worm through anything."

"Cathay doesn't like serpents," said Mavis anxiously.

"You needn't be afraid," said the Princess. "They're dreadful cowards. They know the passage is guarded by our Lobsters. They won't come within a mile of the entrance. But the main body of the enemy will have to pass quite close. There's a great sea mountain, and the only way to our North Tower is in the narrow ravine between that mountain and Merland."

The tunnel ended in a large rocky hall with the armory, hung with ten thousand gleaming shields, on the one side, and the guardroom crowded with enthusiastic Lobsters on the other. The entrance from the sea was a short, narrow passage, in which stood two Lobsters in their beautiful dark coats of mail.

Since the moment when the blue sky that looked first so like sky and then so like painted tin had, touched, confessed itself to be a bubble—confessed, too, in the most practical way, by bursting and letting the water into Merland—the children had been 106