The Wizard of Oz by Lynam Frank Baum Chapter 5 Page 8

The Tin Woodman had asked Dorothy to put the oil-can in her basket. “For,” he said, “if I should get caught in the rain, and rust again, I would need the oil-can badly.”

It was a bit of good luck to have their new comrade join the party, for soon after they had begun their journey again they came to a place where the trees and branches grew so thick over the road that the travelers could not pass.

But the Tin Woodman set to work with his axe and chopped so well that soon he cleared a passage for the entire party.

Dorothy was thinking so earnestly as they walked along that she did not notice when the Scarecrow stumbled into a hole and rolled over to the side of the road. Indeed he was obliged to call to her to help him up again.