John Gill Commentary Joshua 23:9

"For Jehovah hath driven out from before you great nations and strong: but as for you, no man hath stood before you unto this day." — Joshua 23:9 (ASV)

For the Lord has driven out before you great nations and
strong
Especially as they were reckoned in those times, before any great monarchies had existed, as did afterwards; and indeed these were, considering the land they inhabited, very numerous and populous, and were very stout and able bodied men, and some of a gigantic stature; and all dwelt in strong fortified cities, and were able to bring out large armies into the field, with chariots of iron, so that they were very formidable.

But notwithstanding all this, the Lord drove them out of their strong holds, and put Israel into the possession of them, and of their land:

but [as for] you, no man has been able to stand before you to this
day ;
that is, of those that came out against them, and fought with them; these were all to a man cut off by them, or fled before them, and became tributaries to them; otherwise there were many, who as yet were not expelled by them; this the Lord had promised, and now had fulfilled, (Deuteronomy 11:25) (Joshua 1:5) .