Sigmund and the Oak Tree
Sigmund, the son of Volsung, lived in a castle with a giant oak tree growing out of it. A disguised Odin thrusts a powerful sword in the oak and says that whoever can pull it out will be able to keep the mighty sword. No grown men could pull it out, but young Sigmund pulls it out with ease.
Klugh, Maria Tales from the Far North (Chicago, IL: A. Flanagan Company, 1909)