The Amorites forced the Danites into the hill country and did not allow them to come down into the plain.
We are here told upon what terms the rest of the tribes stood with the Canaanites that remained. I. Benjamin neglected to drive the Jebusites out of that part of the city of Jerusalem which fell to their lot, Jdg 1:21. Judah had set them a good example, and gained them great advantages by what they did (Jdg 1:9), but they did not follow the blow for want of resolution.
Commenting on Judges 1:21-36
And the Amorites forced the children of Dan into the mountain,.... Into the mountainous part of the tribe of Dan; the most noted mountains in it were Sear and Baalah, which lay on the border of Judah, Jos 15:10; Joppa in this tribe was built on an high rock, and so Gibbethon, as its name seems to import, perhaps was built on a hill or...
Jdg 1:34-35 Still less were the Danites able to drive the Canaanites out of their inheritance. On the contrary, the Amorites forced Dan up into the mountains, and would not suffer them to come down into the plain. But the territory allotted to the Danytes was almost all in the plain (see at Jos 19:40).
Commenting on Judges 1:34-35