Commentators on the Second Woe

John Gill's Exposition of the Whole Bible

and the heads of the horses were as the heads of lions gaping and roaring for their prey, or all bloody with it, and looked fierce, and savage, and terrible: this designs not so much the strength, boldness, and intrepidity of their horses, which are warlike creatures, and very undaunted in battle, as of the men that sat upon them, who were like David's heroes and warriors, 1 Chronicles 12:8