2 Samuel 5:22

THE PHILISTINES TRY AGAIN TO DEFEAT DAVID

"And the Philistines came up yet again, and spread out in the valley of Rephaim. And when David inquired of the Lord, he said, "You shall not go up; go around to their rear and come upon them opposite the balsam trees. And when you hear the sound of marching in the top of the balsam trees, then bestir yourself,' for then the Lord has gone out before you to smite the army of the Philistines. And David did as the Lord commanded him, and smote the Philistines from Geba to Gezer."

The big thing here is that God Himself achieved this victory over the Philistines. The noise of marching in the tops of the balsam trees probably threw a great panic into the hearts of the Philistines, just as the sound of many trumpets had done for the enemies of Gideon in his victory over the Midianites (Judges 7:15-23).