1 Chronicles 14:13-16

13But the Philistines again raided the valley.

14So David again inquired of God, and God said to him, “Do not go up after them, but circle around behind them and come against them in front of the baca trees .

15As soon as you hear the sound of marching in the tops of the baca trees, then go out to battle. For God has gone out before you to strike down the army of the Philistines.”

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