Which were clothed with blue, captains and rulers, all of them desirable young men, horsemen riding upon horses.
Which were clothed with blue ... all of them desirable young men - rather, 'purple' (Fairbairn). As a lustful woman's passions are fired by showy dress and youthful appearance in men, so Israel was seduced by the pomp and power of Assyria.
Captains and rulers - satraps (cf. Isaiah 10:8).
Horsemen - cavaliers.