Charles Ellicott Commentary 2 Chronicles 13:15

"Then the men of Judah gave a shout: and as the men of Judah shouted, it came to pass, that God smote Jeroboam and all Israel before Abijah and Judah." — 2 Chronicles 13:15 (ASV)

Then the men of Judah gave a shout. —The same verb (hâria‘) occurred in 2 Chronicles 13:12, in the sense of sounding an alarm with the “trumpets of alarm” (t’rû‘ah). Here our version gives the right sense. Immediately after the priests had blown a blast on the trumpets, the warriors raised a shout or war cry .

God smote Jeroboam and all Israel before Abijah and Judah. —The wild panic which seized the host of Israel, when they heard the shout of their foes, is thus forcibly described. The same phrase is used in Judges 20:35, and again by the chronicler (2 Chronicles 14:12) (Compare to the Vulgate, “perterruit Deus Jeroboam et omnem Israel.” Syriac, “the Lord routed,” etc.).