Climax

When the ship could not go no farther because of the strong wave currents. Edmund, Lucy, Reepicheep, and Eustace must take a boat to go further in the World's End. Once they see a tall wave around 30 feet high, the little rat, Reepicheep knows what he must do.

"At that moment, with a crunch, the boat ran aground. The water was too shallow now for it. "This", said Reepicheep, "is where I go on alone." Then he took off his sword ("I shall not need it no more," he said) and flung it far away across the lilied sea. Then he bade them good-bye, trying to be sad for their sakes; but he was quivering with happiness. Then he hastily got into his little boat and took his paddle and the current caught it and away he went, very black against the lilies. Then it vanished, along with the brave little mouse, Reepicheep.

(Chapter 16: The Very End of the World, Page 266)