2 Chronicles 13:12-15

So you see, God is with us. He is our leader. His priests blow their trumpets and lead us into battle against you. O people of Israel, do not fight against the LORD, the God of your ancestors, for you will not succeed!” Meanwhile, Jeroboam had secretly sent part of his army around behind the men of Judah to ambush them. When Judah realized that they were being attacked from the front and the rear, they cried out to the LORD for help. Then the priests blew the trumpets, and the men of Judah began to shout. At the sound of their battle cry, God defeated Jeroboam and all Israel and routed them before Abijah and the army of Judah.