Albert Barnes Commentary Joshua 11:21

"And Joshua came at that time, and cut off the Anakim from the hill-country, from Hebron, from Debir, from Anab, and from all the hill-country of Judah, and from all the hill-country of Israel: Joshua utterly destroyed them with their cities." — Joshua 11:21 (ASV)

At that time—that is, during the “long time” mentioned in Joshua 11:18.

The Anakim—See Numbers 13:22. Since it was the report of the spies concerning the Anakim that, above all, struck terror into the Israelites in the wilderness and caused their faithless complaining and revolt, the sacred writer goes back here in the story to record pointedly the overthrow of this gigantic and formidable race. They had their chief settlements in the mountains around Hebron (Joshua 10:3) or Debir. See Joshua 15:15.

Anab was a city in the mountain district of Judah, lying some distance south of Hebron. It still bears its ancient name.