John Gill Commentary Joshua 10:20

"And it came to pass, when Joshua and the children of Israel had made an end of slaying them with a very great slaughter, till they were consumed, and the remnant which remained of them had entered into the fortified cities," — Joshua 10:20 (ASV)

And it came to pass, when Joshua and the children of Israel ,
&c.] Joshua seems to have pitched his camp at Makkedah, while the rest of his army pursued the fleeing Canaanites, and when he and they were at different places:

had made an end of slaying them with a very great slaughter, till they
were consumed :
and not to be seen in any large bodies, but scattered here and there:

that the rest [which] remained of them entered into fenced cities ;
to which they belonged, and which were afterwards taken, as related in the latter part of this chapter, (Joshua 10:28–42) .