'Mulberry trees' in the Bible

So David enquired of Yahweh, and he said - Thou shalt not go up, - Get round behind them, and come in upon them, over against the mulberry-trees.

And it shall be, when thou shalt hear a sound of marching in the tops of the mulberry-trees, then, shalt thou act with decision, - for, then, will Yahweh have gone forth before thee, to smite the host of the Philistines.

So David, asked again, of God, and God said to him, Thou shalt not go up after them, - get thee round, away from them, so shalt thou come in upon them, over against the mulberry-trees;

and it shall be, when thou hearest a sound of marching in the tops of the mulberry-trees, then, shalt thou go forth into the battle, - for God will have gone forth before thee, to smite the host of the Philistines.