The Devil's Coach-Horses
The essay discusses eaueres, a word found in the 1922 Early English Text Society Edition of Hali Meiðhad. Tolkien suggests that rather than meaning boar, the word should be translated as draught horse.
The Devil's Coach-Horses was first published in The Review of English Studies, Vol. 1 No. 3 (July 1925), and was reprinted in The Review of English Studies, Vol. 1 (1969). The essay also appeared separately as a six-page pamphlet.