2 Chronicles 13:13-18

Now Jeroboam had sent an ambush  around to advance from behind them. So they were in front of Judah, and the ambush was behind them. Judah turned and discovered that the battle was in front of them and behind them, so they cried out to the LORD.  Then the priests blew the trumpets, and the men of Judah raised the battle cry. When the men of Judah raised the battle cry, God routed Jeroboam and all Israel before Abijah and Judah.  So the Israelites fled before Judah, and God handed them over to them.  Then Abijah and his people struck them with a mighty blow, and five hundred thousand fit young men of Israel were killed. The Israelites were subdued at that time. The Judahites succeeded because they depended on the LORD, the God of their ancestors.