John Gill Commentary 2 Chronicles 13:14

"And when Judah looked back, behold, the battle was before and behind them; and they cried unto Jehovah, and the priests sounded with the trumpets." — 2 Chronicles 13:14 (ASV)

And when Judah looked back
On hearing a noise behind them:

behold, the battle was before and behind;
men were set in battle array, and the battle was begun, and an attack made upon them both ways:

and they cried unto the Lord;
for help against their enemies, and to deliver them out of their hands:

and the priests sounded with the trumpets;
to inspire them with cheerfulness, and to suggest to them that God was with them and they need not be afraid.