NET
15 When you hear the sound of marching in the tops of the trees, then attack. For at that moment God is going before you to strike down the army of the Philistines.”
Darby
15 And it shall be, when thou hearest the sound of marching in the tops of the mulberry-trees, that then thou shalt go out to battle; for God will have gone forth before thee to smite the army of the Philistines.
KJV
15 And it shall be, when thou shalt hear a sound of going in the tops of the mulberry trees, [that] then thou shalt go out to battle: for God is gone forth before thee to smite the host of the Philistines.