2 Samuel 5:22-25

Once again the Philistines came and camped at the Valley of Rephaim. When David prayed to the LORD, he answered, “Don’t attack the Philistines from the front. Instead, go around and attack them in front of the balsam trees. When you hear the sound of marching in the tops of the balsam trees, act quickly. I, the LORD, will have gone ahead of you to defeat the Philistine army.” So David did what the LORD commanded. He defeated the Philistines and chased them all the way from Gibeon to Gezer.