Verse 13 points out that the people of Geshur and Maacah had not been driven out of their territories; and at the time of the writing of the account they were still living in Israel. Apparently this verse comes as an afterthought, to correct a false impression which the reader is likely to receive from verse 11. It is then possible to join the last part of verse 12 to verse 13 as follows:

• Moses and the people of Israel had defeated all these people. And they had driven all of them out of their territory. 13 except the people of Geshur and Maacah, who still live among the people of Israel today.

Quoted with permission from Bratcher, Robert G. and Newman, Barclay M. A Handbook on Joshua. (UBS Helps for Translators). New York: UBS, 1983. For this and other handbooks for translators see here .