1 Chronicles 14:13-16

13And the Philistines yet again made a raid in the valley.

14And when David again inquired of God, God said to him, "You shall not go up after them; go around and come against them opposite the balsam trees.

15And when you hear the sound of marching in the tops of the balsam trees, then go out to battle, for God has gone out before you to strike down the army of the Philistines."

16And David did as God commanded him, and they struck down the Philistine army from Gibeon to Gezer.