Genesis 36:35

Who smote Midian— i.e.. The Midianites, in the field of Moab, i.e.. on the frontiers of his country, which joined to that of the Moabites. Bishop Cumberland (Orig. Gent.) imagines, that Moses recorded this exploit, as it proved a calamity to Jethro his father-in-law; and that it was Midian himself, who, according to the Hebrew text, was slain, being at that period one hundred and nine years old.