1 Chronicles 14:13-16

13Once again the Philistines raided the valley. 14So David again inquired of God, who answered him, “Do not march up after them, but circle around them and attack them in front of the balsam trees.1 15As soon as you hear the sound of marching in the tops of the balsam trees, move out to battle, because this will mean that God has gone out before you to strike the camp of the Philistines.”

16So David did as God had commanded him, and they struck down the army of the Philistines all the way from Gibeon to Gezer.