As caterpillars — The Median horses are compared to their insects, either with respect to their numbers, or in regard of the terror caused by them when they came, being a great plague to the places which they infected.
Related Commentaries of Jeremiah 51:27
Jeremiah 51:27
27 Set ye up a standard in the land, blow the trumpet among the nations, prepare the nations against her, call together against her the kingdoms of Ararat, Minni, and Ashchenaz; appoint a captain against her; cause the horses to come up as the rough caterpillers.