Blowhard, Esq. writes:

Anglo-Saxon medical recipes corresponding to Book 2, chapter 59 of Bald’s Leechbook

If a horse or other cattle is elf-shot, take docks seed and Scottish wax and let a man sing twelve masses over them and put holy water on the horse or cattle. Have the herbs always with you. For the same affliction, take an eye of a broken needle, give the horse a prick with it in the ribs. No harm shall come.

— How to cure a horse or cow that was shot by an elf, as described in Bald’s Leechbook, a 10th century English medical manuscript. Download it here. More on Anglo-Saxon medicine here.