2 Chronicles 13:12-17

12Behold, God is with us at our head, and his priests with their battle trumpets to sound the call to battle against you. O sons of Israel, do not fight against the LORD, the God of your fathers, for you cannot succeed.” 13Jeroboam had sent an ambush around to come upon them from behind. Thus his troops were in front of Judah, and the ambush was behind them. 14And when Judah looked, behold, the battle was in front of and behind them. And they cried to the LORD, and the priests blew the trumpets. 15Then the men of Judah raised the battle shout. And when the men of Judah shouted, God defeated Jeroboam and all Israel before Abijah and Judah. 16The men of Israel fled before Judah, and God gave them into their hand. 17Abijah and his people struck them with great force, so there fell slain of Israel 500,000 chosen men.