Myths of the Norsemen From the Eddas and Sagas
Völund, or Wayland the smith, came upon them, and securing 
their swan plumage, the young men forced them to remain upon earth and become their wives. The Valkyrs, thus detained, remained
with their husbands nine years, but at the end of that time, recovering their plumage, or the spell being broken in some other
way, they effected their escape.