Perhaps no mule you ever saw was so lean and bony and altogether plain looking as this Hank, but Betsy loved him dearly because he was faithful and steady and not nearly so stupid as most mules are considered to be.

Betsy had a saddle for Hank, and he declared she would ride on his back, an arrangement approved by the Wizard because it left only four of the party to ride on the seats of the Red Wagon--Dorothy and Button-Bright and Trot and himself.
An old sailor man who had one wooden leg came to see them off and suggested that they put a supply of food and blankets in the Red Wagon inasmuch as they were uncertain how long they would be gone.

This sailor man was called Cap'n Bill.

He was a former friend and comrade of Trot and had encountered many adventures in company with the little girl.

I think he was sorry he could not go with her on this trip, but Glinda the Sorceress had asked Cap'n Bill to remain in the Emerald City and take charge of the royal palace while everyone else was away, and the one-legged sailor had agreed to do so.
They loaded the back end of the Red Wagon with everything they thought they might need, and then they formed a procession and marched from the palace through the Emerald City to the great gates of the wall that surrounded this beautiful capital of the Land of Oz.