No man hath been able, &c. To wit, whom you have attacked; otherwise some of those people did yet remain unconquered. He fighteth Impute not this therefore to your own valour, as you will be apt to do, but to God's gracious and powerful assistance.
Related Commentaries of Joshua 23:9
Joshua 23:9-10
9 For the LORDd hath driven out from before you great nations and strong: but as for you, no man hath been able to stand before you unto this day.
10 One man of you shall chase a thousand: for the LORD your God, he it is that fighteth for you, as he hath promised you.