When you hear the sound of marching in the tops of the trees, act decisively. For at that moment the Lord is going before you to strike down the army ¹  of the Philistines.”

So David again asked God what he should do. ¹  This time ²  God told him, “Don’t march up after them; circle around them and come against them in front of the trees. ³ 

When you hear the sound of marching in the tops of the trees, then attack. ¹  For at that moment the Lord is going before you to strike down the army ²  of the Philistines.”