Poul Anderson 
Valor of Cappen Varra 

We have said that there are many and strange shadows, memories surviving from dim pasts, in this FANTASTIC UNIVERSE of ours. Poul Anderson turns to a legend from the Northern countries, countries where even today the pagan past seems only like yesterday, and tells the story of Cappen Varra, who came to Norren a long, long time ago. Let little Cappen go, they shouted. Maybe he can sing the trolls to sleep