Joshua 17:12, 16-18

Yet the children of Manasseh could not drive out the inhabitants of those cities; but the Canaanites would dwell in that land.

And the children of Joseph said, The hill-country is not enough for us: and all the Canaanites that dwell in the land of the valley have chariots of iron, both they who are in Beth-shean and its towns, and they who are in the valley of Jezreel. And Joshua spake unto the house of Joseph, even to Ephraim and to Manasseh, saying, Thou art a great people, and hast great power; thou shalt not have one lot only: but the hill-country shall be thine; for though it is a forest, thou shalt cut it down, and the goings out thereof shall be thine; for thou shalt drive out the Canaanites, though they have chariots of iron, and though they are strong.