2 Chronicles 21:9

Then Jehoram went forth R.V. Then Jehoram passed over. The Heb. root rendered "pass over" means (a) to pass over a sea or river or other landmark, (b) to pass by persons. In the latter signification it is applied (as here) to the vanguard of an army which passes bythe main body in order to take the lead; cp. Joshua 6:7. In this case Jehoram pushed on with the vanguard (consisting of all his chariots) leaving the "people" (2 Kings 8:21), i.e. the bulk of his army to follow. A disaster ensued. Jehoram was hemmed in by the Edomites, and though he cut his way through them by a night surprise, his success came too late, for the rest of the army, thinking that the vanguard was cut off, dispersed to their homes. This last fact, which explains the failure of the campaign, is omitted by the Chronicler. 2 Kings 8:21 should read, And it came to pass, though he rose by night and smote the Edomites … that the people fled to their tents.

with his princes In 2 Kin. to Zair. Nothing is known of such a place, but some place name is to be expected here.

and the captains of the chariots The clause is governed by the verb "compassed" (read perhaps elfor ethin the Heb.).