Joshua 17:16
And the children of Joseph said, The hill 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 of Bethshean and her towns, and they who are of the valley of Jezreel.
Torrey's Topical Textbook—AKJV

Judges 1:19
And the LORD was with Judah; and he drove out the inhabitants of the mountain; but could not drive out the inhabitants of the valley, because they had chariots of iron.
Torrey's Topical Textbook—AKJV