Left-handed, Heb. shut up on their right hand, i.e. using their left hand instead of their right. Every one could sling stones at an hair breadth, and not miss; an hyperbolical expression, signifying that they could do this with great exactness. There are many parallel instances in historians of persons that could throw stones or shoot arrows with great certainty, so as seldom or never to miss; of which see my Latin Synopsis. And this was very considerable, and one ground of the Benjamites confidence, because in those times they had no guns.
Related Commentaries of Judges 20:16
Judges 20:16
16 Among all this people there were seven hundred chosen men lefthanded; every one could sling stones at an hair breadth, and not miss.